In the data selection window, input beam, output beam, and triple have to be specified, depending on the selected axis item. The selection for channels, baselines, and points are for this input, output beam, or triple only. The ALL OB option is valid only for uv-coverage plots, where it implies that the data of all output beams, channels, and baselines shall be plotted.
A data selection for a specific index (e.g. channel) is made by combining
a directive (ALL, NEXT, CURRENT, PREVIOUS, SELECTED) with a selection
typed into the selection line. A selection line entry is a series of
numbers separated by commas, and/or number ranges consisting of a lower
and upper value separated by a dash. This entry is parsed into a vector
of selected index values (e.g., `2,3,6-9' is parsed into `2,3,6,7,8,9').
Please do not forget to hit 
return
after typing in your
selection line entry!
NEXT and PREVIOUS return a selection of the next or previous
index values, where is the number of selected index values
in the selection line. Thus, if the selection line reads `1,2', NEXT
will select `3,4' for the next plot, then `5,6' and so on. It is not
recommended to select these directives for more than one axis at a time as
they will act simultaneously. The CURRENT directive simply
leaves the current selection unchanged (which is not necessarily identical
to the displayed selection!).
It is not necessary to specify indices or alter the corresponding selection for axis items which do not contain those indices.
The pt and star selection address the same index. Therefore, the star selection is applied after the pt selection as displayed in the data selection widget. When plotting scan data, you can obtain information on which scans correspond to given stars from the UTILITIESLISTSCANS button.
If more than one channel, baseline, or point is selected, multiple plots will appear in the plot window for those indices not corresponding to the selected slice (slice selection is optional in classes scan and astrom; in class point the default slice is pt). In order to have all plots in a single graph, select the ALL IN 1 option.
