Jeremy Sanders points out that the label for delchi plots is wrong or at least misleading. Fixed this by changing the entry in plotLabels.dat. Note that the label is now hardwired for the chi-squared statistic however the delchi plot doesn't make any sense for other statistics.
Jeremy also noted that the y-axis label is a long way to the left and this looks strange. The reason for the position is that with LAB ROT we need to leave space to write numbers of the form
A x 10^(-B). Curiously, we are defaulting to rotated labels for 2-panel plots but unrotated labels for 1-panel plots. I've no idea why. Note that the easy way to move around the position of the y-axis label is
PLT> lab pos y 3.0