It seems not what I want. I want to program the y-scale. Some spectra are better to be displayed in square root, or power, or as a function of x. Instead of changing simply the value of the labels, it is better to display the y-values directly. For example, the XRD patterns look better when displayed as sqrt(I). Of course I can make new columns, but I want to know whether there is a better way since one may have a lot of patterns. Thanks.