Selection according to galactic coordinates l and b
The selection can be performed over galactic longitude only, galactic
latitude only or on both simultaneously.
The options -gt
(larger), -lt (smaller), and -i (between)
may be used for selection on galactic longitude and latitude.
Option
-i only is allowed with the double selection. The latter
perform a selection in a box defined by two l and two b limits.
One needs also to precise the parameter keyword:
l for galactic longitude
b for galactic latitude
lb for the double selection
The command ocl needs one limit for the options -gt et -lt, two limits for the option
-i, and four limits for the option -i and the
keyword lb. The smaller value should always be given first.
Examples:
ocl l -gt 260. select clusters with l < 260 degrees
ocl b -i 10. 20. select clusters with 10 < b < 20 deg.
ocl lb -i 0. 30. -1. +1. select clusters with
galactic coordinates like 0 < l < 30 and -1 < b < +1 deg