The output is one line for each sub-brick of each input file, plus a header line. The number of columns depends upon what stats you request, and the number of ROIs defined in the mask file, but the header row is fairly self-explanitory.
This program was originally written expressly for the purpose of analyzing AFNI data outside of AFNI (Excel, SPSS, etc). You could probably strip out the column you are interested in using "cut", for example, name that file something.1D, and look at it using 1dplot, or "pick ideal" within AFNI.
Tom