This early computer program was to be used with either one or two-dimensional data obtained from multichannel analyzers. It handles groups of up to 1600 channels in the first case, while in the latter, data must be arranged in 16 x 1024, 32 x 512, 64 x 256, or 128 x 128 format, i.e., 16384 channels per group. The data are read from magnetic tape, a group at a time and must meet certain requirements.