Selection according to distance or reddening

The syntax ocl parameter option value allows to make selections on most parameters contained in the catalogue. Standard options are used by the command ocl to select clusters that have parameter values larger (-gt), smaller (-lt) or inbetween (-i) given limits.

The respective parameyter keywords are:

m-M distance modulus
d distance in [pc]
e colour excess

The next item describes the selection on age.

The output is displayed by increasing order of the parameter used in the selection.

Examples:

ocl d -lt 500 lists the clusters nearer than 500 pc
ocl m-M -lt 7.5 lists the clusters that have m-M < 7.5
ocl e -i .30 .40 lists clusters with .30 < E(B-V) < .40