If MODE=0 (the default value), the data stored are just those input with the cursor, giving a `join-the-dots' spectrum. If MODE=1, a spline fit to the data points is carried out, using the subroutine INTEP described by Hill (Publ DAO). A smooth curve (which is supposed to be like one you might draw by hand through all the cursor points) is calculated on the grid of `x' points of the arrays in the top (i.e. numerically largest) stack entry.
It is possible to input data to this routine from a file, rather than at the terminal. The data are expected to be in the form (NDF or native DIPSO) produced by the WRITE command, and MODE is assumed to be 1 (MODE=0 would have the same effect as a simple READ, and is therefore redundant). Thus, using this option makes CDRAW act essentially as a straightforward spline interpolation routine.
DIPSO --- A friendly spectrum analysis program