Getting started

Weeds has been distributed with GILDAS since March 2010. Provided that you have installed GILDAS with the Python extension (named PyGILDAS)¹you should have Weeds already installed on your computer. If this is not the case, please refer to the GILDAS documentation for instructions on how to install PyGILDAS.

Let us first start CLASS from a terminal:

[fontsize=\scriptsize]
% class
GILDAS Version: dev (18mar14 12:00) (x86_64-darwin-gfortran) executable tree

 * Welcome to CLASS   

 * Loaded modules
    atm
    sic (J.Pety, S.Bardeau, S.Guilloteau, E.Reynier)
    greg (J.Pety, S.Bardeau, S.Guilloteau, E.Reynier)
    ephem (F.Gueth, J.Pety)
    class (S.Bardeau, J.Pety, P.Hily-Blant, S.Guilloteau)

 * Loaded extensions
    weeds (S.Maret, P.Hily-Blant, J.Pety, S.Bardeau, E.Reynier)

(...)
LAS>

Note that the welcome message mentions that the Weeds extension as been loaded. The extension defines a language, named weeds\. This language has a number of commands, the list of which can be obtained by typing:

[fontsize=\scriptsize]
LAS90> help weeds\
 
    Weeds is a CLASS extension to analyze spectral surveys or spectral lines
    observations with large bandwidths.  It  provides  several  commands  to
    identify lines on a spectrum and to model it.
 
    Available commands:
        LID       Identify lines on the current spectra
        LFIND     Find lines from a species within a frequency range
        LLIST     List lines from the line index
        LGET      Get a line from the line index
        LPLOT     Plot a line from the current line index
        MODSOURCE Model the emission of a source at the LTE
        MODSHOW   Show the results of MODSOURCE
 
    For more information of each command, type 'help <command>'

Each of the commands provided by Weeds has an extensive documentation. Type help followed by the command name to read it.