15.59.4  SPLIT 

SPLIT=ON  splits  channels to preserve the total sum over the projections.
For example X channels run from 0 to 1, 1 to 2 ...  9 to 10.
     TD:PROJECT  X FROM 0 TO 10 BY 2.5 Will produce 4 projections, but the
sum over all projections will not be equal to the original sum.
     TD:PROJECT SPLIT X FROM 0 TO 10 BY 2.5
Produces a set of projections and preserves the sum.
(Default:SPLIT=OFF)