.nf
/FOCUS f1 f2 [... f18] [direction]
or
/FOCUS NO

[For Lissajous] designate the purpose of the scan to be "Focus", i.e.,
to determine focus corrections.  A subscan with a Lissajous curve will
be executed for each focus offset specified.

Real      :: f1 f2 [... f18]   ! focus offsets [mm]
                               ! (at least 2, at most 18 values)
Character :: direction         ! direction of focus offsets, one of:
                               ! X 
                               ! Y
                               ! Z 

/FOCUS NO clears the option /FOCUS.
.fi
