Column labels

It is possible to give each column in a file a symbolic name that can be used to reference the column when reading the file and can be automatically transferred to the appropriate axis label on the plot. To do this, the first line of the file should be of the form:

!$label 1$label 2$label 3$

where there are as many labels, each delimited by a $, as there are columns. Care should be taken to ensure that there is no leading white space in the column labels, although it is permissible for the column labels to contain white space elsewhere. Any padding that is required to make the column labels line up with the data columns should be achieved with multiple dollar signs, e.g. :

!$RA$$$$Declination$

When specifying the column on the command line, e.g. YCOL Dec, it is permissible to abbreviate the string to a minimum match. However, the match is case-sensitive.