EXT: Extract Region.
-time Extract Time Domain.
-left Extract Left Half.
-right Extract Right Half.
-mid Extract Center Half.
-round n [1] Round size to nearest N.
-pow2 Round size to nearest power of 2.
-sw Adjust Sweep Width
and ppm calibration.
Extract Region Coordinates;
Valid Units: Pts Hz ppm %
-x1 xFirst [1] X Extract Range Start.
-xn xLast [XSIZE] X Extract Range End.
-y1 yFirst [1] Y Extract Range Start.
-yn yLast [YSIZE] Y Extract Range End.
