Sets the instrument used in constructing and accessing the observation catalogue
Syntax:
xsel > set instrument <set_instru>
Example:
xsel > set inst sis0
This sets the instrument to sis0. If you have forgotten the names of the available instruments, just say set instruments without an argument:
xsel > set instru
The available instruments are:
     SIS0
     SIS1
     GIS2
     GIS3
which instru? []