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pen movement operators

Ck - set pen color to k
S - set origin, increment for the pen
U - set overall y-offset for the graph
A, a - zero multiple line offset, increment offset
G, H - move to first point, normal or hidden
g, h - move to additional point, normal or visible
s - push, then increment the pen position

There are several documents available explaining REC [1], including a file in the rec subproject of each of the REC files.