Moves the lower filter wheel to the specified position. Normally, the two filter wheels are set using the /FILTER qualifier; this qualifier is provided to allow unusual settings of the lower filter wheel. The position may be specified by a number in the range 1-16, or by name. The position names are:
Blank, Clear, J, H,
KP, KN, K, L,
Ice (NB310), Dust3.28 (NB328), Dust3.4 (NB340), Cont3.6 (NB360),
Cont4.0 (NB400), BrAlpha (NB405), M, PK50
These names may be abbreviated. Alternative names for a position are
shown in parentheses. This qualifier cannot be specified with the /FILTER
qualifier.