Fig. 6From: Laser-based techniques for the non-invasive characterisation of grisaille paints on stained-glass windowsExample of depth scans of the NLOM-MPEF signals (black line) on the grisaille paint layers from samples JC012 (a) and JC015a (b). The Lorentzian function fit is marked in red. The FWHM values of the fits after refractive index correction, which give the values of thickness, are indicated in blueBack to article page