10 FIGARO ECHARC IMPORT/EXPORT

In order to provide backward compatibility with the extensive line fitting ECHARC software, echomop provides the ability to import/export sets of line positions/identifications between itself and ECHARC. These facilities are provided from the main menu of the ech_idwave task/ECHMENU Option 10.

The exchange of information takes place on two levels. ECHARC requires an arc spectrum array organised on an NX by number-of-orders basis, plus a set of order numbers (1…n) in another array. These are setup in a Starlink (NDF) file. This file should be given to ECHARC as its input image. ECHARC reads from and writes to the other file; an ASCII file listing the order number, position, and wavelengths of all identified features.

This file has the name ECHARC.LIS and is placed in the current directory. ECHARC also uses the arc line reference lists (i.e., /arctype/.ARC) and the same file should of course be used with both programs.

Note that the ECHMENU ECHARC export option must be used first in order to create the file required to use ECHARC, this must be done even if no lines are identified before ECHARC is run.