If the cursor Y value is negative, the plot is assumed to be of X v Log10(FLUX). In this case, the Y values plotted (and left in the `current' arrays) are logs of the normalised model atmosphere fluxes; however, the unnormalised atmosphere data in the `current' arrays MUST be linear in Y to start off with (i.e. in the form resulting from an ATLASRD). ATNORM can also be used to normalise black-body fluxes generated with BBODY.
DIPSO --- A friendly spectrum analysis program