{Reference Type}: Journal Article {Title}: Analysis of multicrystal pump-probe data sets. II. Scaling of ratio data sets. {Author}: Fournier B;Sokolow J;Coppens P; {Journal}: Acta Crystallogr A Found Adv {Volume}: 72 {Issue}: 0 {Year}: Mar 2016 {Factor}: 2.331 {DOI}: 10.1107/S2053273315024055 {Abstract}: Two methods for scaling of multicrystal data collected in time-resolved photocrystallography experiments are discussed. The WLS method is based on a weighted least-squares refinement of laser-ON/laser-OFF intensity ratios. The other, previously applied, is based on the average absolute system response to light exposure. A more advanced application of these methods for scaling within a data set, necessary because of frequent anisotropy of light absorption in crystalline samples, is proposed. The methods are applied to recently collected synchrotron data on the tetra-nuclear compound Ag2Cu2L4 with L = 2-diphenylphosphino-3-methylindole. A statistical analysis of the weighted least-squares refinement residual terms is performed to test the importance of the scaling procedure.