Arc Line Lists

Line list files are stored in ASCII format for ease of maintenance. ECHOMOP reads the line list(s) and creates its own proprietary file format. Line-list filenames are expected to have the extension .ARC and are searched for in the standard FIGARO search paths.

The format of arc line lists is as follows

    ! comment lines start with a !

    nnnn.mmm   iii.jj    text

    nnnn.mmm   iii.jj    text

    nnnn.mmm   iii.jj    text

where

    nnnn.mmm   is a wavelength in Angstroms
    iii.jj     is an (optional) intensity estimate
    text       is a description of the line e.g. Th II

In addition, a special comment line is recognised which allows the units of wavelength to be specified:

    !WAVELENGTH_UNITS=some-unit=specifier

The default units are Angstroms and the package does not use the units string except for output messages.

User-created lists should be placed in the directory pointed to by the environment variable $ADAM_USER.