This directory contains extinction funcntions.

PARAMETERS:

    The following extinction parameters are used.

          title - Title used for labeling of output.
    description - Multiple lines of text used for documentation of output.
     tablescale - Factor by which to multiply the table values.

TABLE:

    The extinction table has two columns, the wavelength in Angstroms and
    the extinction in magnitudes per airmass.  If no table is given
    then no extinction is assumed.  However, if no extinction is desired
    then probably no extinction table will be specified at all.

EXAMPLE

    # title = " KPNO Standard Extinction"

    3200. 1.017
    3250. 0.881
    3300. 0.787
       ...
    9832. 0.053
    10256. 0.023
    10400. 0.024

    # Last four extinction coefficients from CTIO list - no data available
    # for KPNO.

SYNTAX:

    Comment lines begin with '#' and can contain any text and can occur
    anywhere in the file, though normally found at the beginning.

    Parameters are comment lines with the form

	# <parameter> = <value>

    where whitespace is required between each field, <parameter> is a single
    word parameter name, and <value> is a single word value.  A quoted string
    is a single word so if the value contains whitespace it must be quoted.
    Any text following the value is ignored.

    The optional table is a multicolumn list of numeric values.  The list
    must be in increasing order in the independent columns.  Only 1D (two
    columns) and 2D (three columns) tables are currently supported.  2D
    tables must form a regular grid.  The table will be interpolated.
    Extrapolation outside of the table consists of the taking the nearest
    value; thus, a single line defines a constant value for all values of
    the independent variable.  If a "tablescale" parameter is specified
    then the table values are multiplied by this value.
