Grace Data File Options
For more information on Grace see http://plasma-gate.weizmann.ac.il/Grace/.
Write
[invert] [xydy]
invert
Normally, data is written out with X-values pertaining to frames (i.e. data over all trajectories is printed in columns). This command flips that behavior so that X-values pertain to data sets.
xydy
Combine consecutive pairs of sets into XYDY sets