Article(id=1256536357556597158, tenantId=1146029695717560320, journalId=1256314692575182859, issueId=1256536349243523385, articleNumber=null, orderNo=null, doi=10.16035/j.issn.1001-7283.2026.02.030, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1738684800000, receivedDateStr=2025-02-05, revisedDate=1741017600000, revisedDateStr=2025-03-04, acceptedDate=null, acceptedDateStr=null, onlineDate=1777511212958, onlineDateStr=2026-04-30, pubDate=1776182400000, pubDateStr=2026-04-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1777511212958, onlineIssueDateStr=2026-04-30, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1777511212958, creator=13701087609, updateTime=1777511212958, updator=13701087609, issue=Issue{id=1256536349243523385, tenantId=1146029695717560320, journalId=1256314692575182859, year='2026', volume='42', issue='2', pageStart='1', pageEnd='264', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=0, createTime=1777511210976, creator=13701087609, updateTime=1777511532015, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1256537695891874281, tenantId=1146029695717560320, journalId=1256314692575182859, issueId=1256536349243523385, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1256537695891874282, tenantId=1146029695717560320, journalId=1256314692575182859, issueId=1256536349243523385, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=238, endPage=246, ext={EN=ArticleExt(id=1256536358949106102, articleId=1256536357556597158, tenantId=1146029695717560320, journalId=1256314692575182859, language=EN, title=Effects of Soil Moisture on Digital Image Estimation of Soil Organic Carbon, columnId=null, journalTitle=Crops, columnName=null, runingTitle=null, highlight=null, articleAbstract=
To explore the impact of soil moisture variation on the relationship between soil organic carbon (SOC) and color characteristic parameters, and to construct quantitative SOC prediction models based on color parameters, soil sample images under different soil moisture content (SMC) conditions were acquired by simulating continuous changes of farmland soil moisture to extract color characteristic parameters. Various mathematical transformation methods were employed to optimize these parameters. Combined with correlation analysis and regression models, the influence of soil moisture on the relationship between color characteristics and SOC was quantified, and SOC quantitative estimation models under different moisture conditions were established. The results indicated that SOC was significantly and negatively correlated with color characteristic parameters in RGB, HSV, and CIELab color spaces, with R, L, and V components showing the highest correlation. Reciprocal and logarithmic transformations enhanced these correlations. Soil moisture affected color component values; as SMC increased, most color parameter values decreased, and their correlation with SOC gradually weakened. Critical moisture contents were identified as SMC=15%. Color parameters such as 1/b*, lnb*, 1/S, and lnS effectively mitigated the impact of moisture on SOC prediction models. Under different moisture conditions, the BP neural network regression model outperformed the linear regression model, demonstrating superior predictive capability. This study demonstrates that the color characteristic parameters of digital images can be effectively utilized for the quantitative analysis of SOC.
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为探索土壤水分变化对土壤有机碳(SOC)与颜色特征参数关系的影响,并构建基于颜色参数的SOC定量预测模型,通过模拟农田土壤水分的连续变化获取不同土壤含水量(SMC)条件下的土样图像,提取颜色特征参数,采用多种数学变换方法对颜色参数进行优化,结合相关性分析和回归模型量化土壤水分对颜色特征与SOC关系的影响,构建不同含水量下的SOC定量估算模型。结果表明,SOC与颜色特征参数在RGB、HSV和CIELab 3种颜色空间中呈显著负相关,且R、L和V分量值与SOC的相关性最高,颜色参数的倒数和对数变换能够增强其相关性。土壤水分影响颜色分量值,随着土壤含水量的增加,多数颜色参数值降低,且与SOC的相关性逐渐减弱。临界含水量为SMC=15%时,1/b*、lnb*、1/S和lnS等颜色参数能够有效减轻水分对SOC预测模型的影响。在不同水分条件下,BP神经网络回归模型优于线性回归模型,表现出更好的预测能力。研究表明数字图像的颜色特征参数可用于SOC的定量分析。
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数学物理学报,
2025,
45(3):992-1012., articleTitle=响应变量缺失下条件平均处理效应的k近邻核估计, refAbstract=null)], funds=[Fund(id=1256536474103722399, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, awardId=2023YCX36, language=CN, fundingSource=山西农业大学农学院研究生教育改革与质量提升工程项目(2023YCX36), fundOrder=null, country=null), Fund(id=1256536474921611690, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, awardId=2024CYJSTX02-23, language=CN, fundingSource=山西省现代农业产业技术体系建设专项资金(2024CYJSTX02-23), fundOrder=null, country=null), Fund(id=1256536475756278199, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, awardId=202203021211275, language=CN, fundingSource=山西省应用基础研究计划项目(202203021211275), fundOrder=null, country=null), Fund(id=1256536477358502334, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, awardId=202303021212090, language=CN, fundingSource=山西省应用基础研究计划项目(202303021212090), fundOrder=null, country=null), Fund(id=1256536477576606150, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, awardId=31871571, language=CN, fundingSource=国家自然科学基金(31871571), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1256536381095031466, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, xref=null, ext=[AuthorCompanyExt(id=1256536381162140334, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, companyId=1256536381095031466, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=College of Agronomy, Shanxi Agricultural University, Jinzhong 030801, Shanxi, China), AuthorCompanyExt(id=1256536381397021361, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, companyId=1256536381095031466, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=山西农业大学农学院, 030801, 山西晋中)])], figs=[ArticleFig(id=1256536446081577110, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=EN, label=Fig.1, caption=
Variation of color components in different SMC groups, figureFileSmall=3SvhWC2KOl/+NaHIWungfQ==, figureFileBig=FgfRkKuAIP27gdCGWHxbrw==, tableContent=null), ArticleFig(id=1256536447440531617, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=CN, label=图1, caption=
不同SMC分组的各颜色分量变化, figureFileSmall=3SvhWC2KOl/+NaHIWungfQ==, figureFileBig=FgfRkKuAIP27gdCGWHxbrw==, tableContent=null), ArticleFig(id=1256536451026661563, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=EN, label=Fig.2, caption=
Correlation analysis of color parameters and SOC before and after image processing, figureFileSmall=GtWqU8qgF+5Ax3iQ6baX3g==, figureFileBig=mH25sgvFspUkngxpxix5Lg==, tableContent=null), ArticleFig(id=1256536451936825543, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=CN, label=图2, caption=
图像处理前后各颜色参数与SOC的相关性分析, figureFileSmall=GtWqU8qgF+5Ax3iQ6baX3g==, figureFileBig=mH25sgvFspUkngxpxix5Lg==, tableContent=null), ArticleFig(id=1256536452716966096, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=EN, label=Fig.3, caption=
Correlation analysis between SMC, SOC and color parameters, figureFileSmall=k7Op3zrkoTYGIOFmK3SqAA==, figureFileBig=yj6m8pu7GkuLR0DpEzikCQ==, tableContent=null), ArticleFig(id=1256536454390493403, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=CN, label=图3, caption=
SMC、SOC与各颜色参数的相关性分析, figureFileSmall=k7Op3zrkoTYGIOFmK3SqAA==, figureFileBig=yj6m8pu7GkuLR0DpEzikCQ==, tableContent=null), ArticleFig(id=1256536455636201699, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=EN, label=Fig.4, caption=
Correlation of color parameters (a) and their mathematical transformation (b) with SOC in different SMC groups, figureFileSmall=2mxHo8iWG7W0Q7OkNt5qBg==, figureFileBig=Yia4iuLCcXrzJoZ9XGEF8w==, tableContent=null), ArticleFig(id=1256536456458285294, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=CN, label=图4, caption=
不同SMC分组下各颜色参数(a)及其数学变换后(b)与SOC的相关性, figureFileSmall=2mxHo8iWG7W0Q7OkNt5qBg==, figureFileBig=Yia4iuLCcXrzJoZ9XGEF8w==, tableContent=null), ArticleFig(id=1256536457301340405, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=EN, label=Fig.5, caption=
SOC of each color feature parameter based on univariate linear regression model in groups, figureFileSmall=Jmae7WnBURJU8JAiMoa8Xg==, figureFileBig=wF/RU0ysa4/B3xMfdPFN2w==, tableContent=null), ArticleFig(id=1256536459910197518, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=CN, label=图5, caption=
各颜色特征参数基于单变量线性回归模型的各组SOC表现, figureFileSmall=Jmae7WnBURJU8JAiMoa8Xg==, figureFileBig=wF/RU0ysa4/B3xMfdPFN2w==, tableContent=null), ArticleFig(id=1256536460715503899, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=EN, label=Fig.6, caption=
Performance of the optimal color parameter models for SOC in each group, figureFileSmall=BurBG41C1mCUUknoaMTzjA==, figureFileBig=IRVwQVa+FJYizdZKpCcTIw==, tableContent=null), ArticleFig(id=1256536461520810277, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=CN, label=图6, caption=
各组SOC最优颜色参数模型的表现, figureFileSmall=BurBG41C1mCUUknoaMTzjA==, figureFileBig=IRVwQVa+FJYizdZKpCcTIw==, tableContent=null), ArticleFig(id=1256536462418391349, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=EN, label=Table 1, caption=
Descriptive statistics of SOC and SMC in each group
, figureFileSmall=null, figureFileBig=null, tableContent=
变量 Variable | 分组 Group | 全距 Range | 最大值 Max. | 最小值 Min. | 均值 Mean | 标准差 SD | 偏度 Skewness | 峰度 Kurtosis | 变异系数 CV (%) |
| SOC (g/kg) | | 110.293 | 112.618 | 2.325 | 24.240 | 20.531 | 0.739 | 1.279 | 72.010 |
| SMC (%) | 1 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| 2 | 4.766 | 4.939 | 0.172 | 1.620 | 0.818 | 0.858 | 4.696 | 50.531 |
| 3 | 13.565 | 14.871 | 5.036 | 8.895 | 3.110 | -0.032 | -0.015 | 35.057 |
| 4 | 11.388 | 25.008 | 15.610 | 19.665 | 2.910 | 0.130 | -0.725 | 14.809 |
| 5 | 9.711 | 35.001 | 25.290 | 30.087 | 3.010 | 0.220 | -1.352 | 10.035 |
| 6 | 10.372 | 45.379 | 35.008 | 40.495 | 3.100 | -0.495 | -0.999 | 7.664 |
| 7 | 14.098 | 56.045 | 41.946 | 49.538 | 2.860 | -0.188 | 0.214 | 5.776 |
), ArticleFig(id=1256536464117084477, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=CN, label=表1, caption=
SOC和各组SMC的描述性统计
, figureFileSmall=null, figureFileBig=null, tableContent=
变量 Variable | 分组 Group | 全距 Range | 最大值 Max. | 最小值 Min. | 均值 Mean | 标准差 SD | 偏度 Skewness | 峰度 Kurtosis | 变异系数 CV (%) |
| SOC (g/kg) | | 110.293 | 112.618 | 2.325 | 24.240 | 20.531 | 0.739 | 1.279 | 72.010 |
| SMC (%) | 1 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| 2 | 4.766 | 4.939 | 0.172 | 1.620 | 0.818 | 0.858 | 4.696 | 50.531 |
| 3 | 13.565 | 14.871 | 5.036 | 8.895 | 3.110 | -0.032 | -0.015 | 35.057 |
| 4 | 11.388 | 25.008 | 15.610 | 19.665 | 2.910 | 0.130 | -0.725 | 14.809 |
| 5 | 9.711 | 35.001 | 25.290 | 30.087 | 3.010 | 0.220 | -1.352 | 10.035 |
| 6 | 10.372 | 45.379 | 35.008 | 40.495 | 3.100 | -0.495 | -0.999 | 7.664 |
| 7 | 14.098 | 56.045 | 41.946 | 49.538 | 2.860 | -0.188 | 0.214 | 5.776 |
), ArticleFig(id=1256536464930779468, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=EN, label=Table 2, caption=
Variations of color parameters under different SOC levels
, figureFileSmall=null, figureFileBig=null, tableContent=
变量 Variable | SOC (g/kg) |
| <20 | | 20~40 | | >40 |
均值 Mean | 标准差 SD | 最小值 Min. | 最大值 Max. | 均值 Mean | 标准差 SD | 最小值 Min. | 最大值 Max. | 均值 Mean | 标准差 SD | 最小值 Min. | 最大值 Max. |
| R | 120.50 | 10.19 | 110.47 | 152.66 | | 110.58 | 6.36 | 96.90 | 122.09 | | 96.12 | 18.24 | 62.13 | 118.51 |
| G | 95.24 | 6.85 | 84.83 | 106.55 | | 88.09 | 4.12 | 81.04 | 97.76 | | 77.09 | 16.71 | 46.58 | 99.96 |
| B | 63.49 | 7.71 | 46.88 | 76.80 | | 59.55 | 4.74 | 48.62 | 66.74 | | 53.17 | 13.84 | 28.53 | 69.72 |
| L* | 81.16 | 2.75 | 77.15 | 85.83 | | 78.14 | 1.70 | 74.73 | 82.01 | | 72.62 | 8.19 | 56.75 | 82.68 |
| a* | 5.49 | 2.94 | 2.19 | 13.87 | | 5.02 | 2.18 | 2.31 | 9.95 | | 4.83 | 2.07 | 2.02 | 8.17 |
| b* | 27.35 | 4.40 | 21.10 | 37.30 | | 25.81 | 3.91 | 20.06 | 33.58 | | 23.89 | 3.88 | 18.57 | 31.85 |
| H | 205.90 | 2.23 | 202.97 | 211.55 | | 206.00 | 2.49 | 203.22 | 212.11 | | 206.30 | 2.28 | 202.12 | 212.15 |
| S | 40.51 | 8.37 | 29.34 | 65.66 | | 36.23 | 6.13 | 26.51 | 46.51 | | 30.48 | 6.46 | 20.71 | 44.78 |
| V | 161.20 | 11.72 | 146.53 | 182.86 | | 149.09 | 6.30 | 135.52 | 162.12 | | 130.70 | 27.58 | 80.54 | 166.38 |
), ArticleFig(id=1256536466201653593, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=CN, label=表2, caption=
不同SOC等级的颜色参数差异变化
, figureFileSmall=null, figureFileBig=null, tableContent=
变量 Variable | SOC (g/kg) |
| <20 | | 20~40 | | >40 |
均值 Mean | 标准差 SD | 最小值 Min. | 最大值 Max. | 均值 Mean | 标准差 SD | 最小值 Min. | 最大值 Max. | 均值 Mean | 标准差 SD | 最小值 Min. | 最大值 Max. |
| R | 120.50 | 10.19 | 110.47 | 152.66 | | 110.58 | 6.36 | 96.90 | 122.09 | | 96.12 | 18.24 | 62.13 | 118.51 |
| G | 95.24 | 6.85 | 84.83 | 106.55 | | 88.09 | 4.12 | 81.04 | 97.76 | | 77.09 | 16.71 | 46.58 | 99.96 |
| B | 63.49 | 7.71 | 46.88 | 76.80 | | 59.55 | 4.74 | 48.62 | 66.74 | | 53.17 | 13.84 | 28.53 | 69.72 |
| L* | 81.16 | 2.75 | 77.15 | 85.83 | | 78.14 | 1.70 | 74.73 | 82.01 | | 72.62 | 8.19 | 56.75 | 82.68 |
| a* | 5.49 | 2.94 | 2.19 | 13.87 | | 5.02 | 2.18 | 2.31 | 9.95 | | 4.83 | 2.07 | 2.02 | 8.17 |
| b* | 27.35 | 4.40 | 21.10 | 37.30 | | 25.81 | 3.91 | 20.06 | 33.58 | | 23.89 | 3.88 | 18.57 | 31.85 |
| H | 205.90 | 2.23 | 202.97 | 211.55 | | 206.00 | 2.49 | 203.22 | 212.11 | | 206.30 | 2.28 | 202.12 | 212.15 |
| S | 40.51 | 8.37 | 29.34 | 65.66 | | 36.23 | 6.13 | 26.51 | 46.51 | | 30.48 | 6.46 | 20.71 | 44.78 |
| V | 161.20 | 11.72 | 146.53 | 182.86 | | 149.09 | 6.30 | 135.52 | 162.12 | | 130.70 | 27.58 | 80.54 | 166.38 |
), ArticleFig(id=1256536469041197415, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=EN, label=Table 3, caption=
Performance of SOC prediction models for critical moisture content grouping and the entire group
, figureFileSmall=null, figureFileBig=null, tableContent=
组分 Group | 建模方法 Model method | 校正集 Calibration set | | 验证集 Validation set |
| Rc2 | RMSEc | RPDc | Rv2 | RMSEv | RPDv |
干燥组 Dry group | MLR | 0.630 | 1.249 | 1.612 | | 0.560 | 1.401 | 1.525 |
| SMLR | 0.659 | 1.170 | 1.720 | | 0.595 | 1.310 | 1.576 |
| BP-ANN | 0.829 | 1.139 | 1.768 | | 0.713 | 1.266 | 1.687 |
湿润组 Moist group | MLR | 0.627 | 1.221 | 1.669 | | 0.653 | 1.307 | 1.570 |
| SMLR | 0.634 | 1.241 | 1.642 | | 0.655 | 1.293 | 1.587 |
| BP-ANN | 0.815 | 1.180 | 1.727 | | 0.720 | 1.116 | 1.838 |
全组 Entire group | MLR | 0.641 | 1.228 | 1.675 | | 0.672 | 1.204 | 1.658 |
| SMLR | 0.754 | 1.270 | 1.620 | | 0.689 | 1.377 | 1.449 |
| BP-ANN | 0.793 | 1.271 | 1.618 | | 0.710 | 1.499 | 1.415 |
), ArticleFig(id=1256536469951361396, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=CN, label=表3, caption=
临界含水量分组与全组SOC预测模型表现
, figureFileSmall=null, figureFileBig=null, tableContent=
组分 Group | 建模方法 Model method | 校正集 Calibration set | | 验证集 Validation set |
| Rc2 | RMSEc | RPDc | Rv2 | RMSEv | RPDv |
干燥组 Dry group | MLR | 0.630 | 1.249 | 1.612 | | 0.560 | 1.401 | 1.525 |
| SMLR | 0.659 | 1.170 | 1.720 | | 0.595 | 1.310 | 1.576 |
| BP-ANN | 0.829 | 1.139 | 1.768 | | 0.713 | 1.266 | 1.687 |
湿润组 Moist group | MLR | 0.627 | 1.221 | 1.669 | | 0.653 | 1.307 | 1.570 |
| SMLR | 0.634 | 1.241 | 1.642 | | 0.655 | 1.293 | 1.587 |
| BP-ANN | 0.815 | 1.180 | 1.727 | | 0.720 | 1.116 | 1.838 |
全组 Entire group | MLR | 0.641 | 1.228 | 1.675 | | 0.672 | 1.204 | 1.658 |
| SMLR | 0.754 | 1.270 | 1.620 | | 0.689 | 1.377 | 1.449 |
| BP-ANN | 0.793 | 1.271 | 1.618 | | 0.710 | 1.499 | 1.415 |
), ArticleFig(id=1256536470794416513, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=EN, label=Table 4, caption=
Optimal color parameters of each group
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| 分组Group | 最优颜色参数Optimal color parameter |
1
| R,G,L*,V,R+B,R+G,G-B,1/R,1/G,lnR,lnG,R*G,1/L*,lnL*,1/S,lnS,1/V,lnV,S+V,S*V |
2
| R,L*,b*,S,R-B,R-G,R+G,G-B,ExR,1/R,1/G,lnR,lnG,1/L*,lnL*,1/b*,lnb*,1/S,lnS,1/V,lnV,S+V |
| 3 | S,R-B,G-B,lnR,1/b*,lnb*,1/S,lnS |
4
| R,b*,S,R-B,G-B,ExR,1/R,lnR,1/b*,lnb*,1/S,lnS,S+V,S+V |
| 5 | b*,G-B,1/b*,lnb*,1/S,lnS |
| 6 | b*,1/b*,lnb*,1/S,lnS |
| 7 | 1/b*,lnb*,1/S,lnS |
), ArticleFig(id=1256536473139032464, tenantId=1146029695717560320, journalId=1256314692575182859, articleId=1256536357556597158, language=CN, label=表4, caption=
各组最优颜色参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 分组Group | 最优颜色参数Optimal color parameter |
1
| R,G,L*,V,R+B,R+G,G-B,1/R,1/G,lnR,lnG,R*G,1/L*,lnL*,1/S,lnS,1/V,lnV,S+V,S*V |
2
| R,L*,b*,S,R-B,R-G,R+G,G-B,ExR,1/R,1/G,lnR,lnG,1/L*,lnL*,1/b*,lnb*,1/S,lnS,1/V,lnV,S+V |
| 3 | S,R-B,G-B,lnR,1/b*,lnb*,1/S,lnS |
4
| R,b*,S,R-B,G-B,ExR,1/R,lnR,1/b*,lnb*,1/S,lnS,S+V,S+V |
| 5 | b*,G-B,1/b*,lnb*,1/S,lnS |
| 6 | b*,1/b*,lnb*,1/S,lnS |
| 7 | 1/b*,lnb*,1/S,lnS |
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