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%

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