space">kind</SPAN>: 0=ignore, 1=potential, 2=afrac, 3=R-matrix energy,
<BR>
4=R-mat partial width, 5=dataset normalisation
<BR><SPAN style="font-family:monospace">step</SPAN>: step size for finding derivatives etc, zero for fixed. (default 0.01)
<BR><SPAN style="font-family:monospace">valmin</SPAN>: strict lower bound (if non-zero),
<BR><SPAN style="font-family:monospace">valmax</SPAN>: strict upper bound (if non-zero), 
<BR><SPAN style="font-family:monospace">null</SPAN>: (default -124578) `undefined' valu