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NCINIT, NCTERM, NCSTEP.......Initial, terminal, and increment values for the frame column index in a multi-frame plot. These values are not altered when RESET = .TRUE., because their values are needed across multiple input data groups, each of which is displayed in one frame of the multi-frame plot. Thus, these values must be reset to 1 in the last frame group if you wish to revert to the standard single frame plotting. The page is divided into frames like this: ---top--- 11 12 13 14 .... 1M 21 22 23 24 .... 2M 31 32 33 34 .... 3M .................................. N1 N2 N3 N4 .... NM ---bottom--- Either NCINIT or NCTERM should normally be 1, and the increment, NCSTEP, should be positive for normal left-to-right frame advances, and negative for right-to-left advances. The setting of BYROWS selects whether frames in displayed in row order, or in column order.