Hello! I found that I could not make any array (of any sort) that exceeded 8 dimensions using IDL 8.3. For instance, the command "m1=fltarr(2,2,2,2,2,2,2,2,2)" results in the following response: "% FLTARR: Incorrect number of arguments." However, the following command is okay: "m2=fltarr(2,2,2,2,2,2,2,4)". Arrays m1 and m2 have an equal amount of elements, but m1 has 9 dimensions and m2 has 8 dimensions. Therefore, it does not seem to be a memory problem. So, why is this? And more important, how do I fix this? Cheers, Wouter