READSPEC,<SpecFile>,<numLines>,<Line1> … <LineN>
Reads a spectrum file into a line object for plotting.
NOTE: Line objects in ACS SASSI are read from the columns in a data file. For TFI, TFI, TFD, and RS files, the frequency column should not be counted in the <numLines> argument. For example, an RS file has a column for frequency and a column for acceleration. In this case, <numLines> is 1 because there is only one column of data to be read into a line object for plotting.