Hello everyone. I am new to Topas 6 and I started teaching myself by following the instructions on the tutorial textbook. I started with the Individual Line Fitting exercises. However, when I push the Run button the fitting Rwp is too large, and the plot window remains blank, as if fitting was not concluded. When I press again nothing changes. I do not know if it is processing the fitting because there is no identication that the run is ongoing or finished. Can somebody help me what I am doing wrong? Thanks in advance.