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Table 2 Eigenvalues with the relative and cumulative variance obtained by the PCA analysis of the colour and spectral data before cleaning

From: Setup of a sustainable indoor cleaning methodology for the sculpted stone surfaces of the Duomo of Milan

Component Eigenvalue % Explained or relative variance % Cumulative variance
1 26.350 77.499 77.50%
2 7.530 22.147 99.65%
3 0.106 0.313 99.96%
4 0.009 0.027 99.99%
5 0.003 0.007 99.99%
6 0.002 0.005 100.00%