format=0

widget without up/down arrows (default).

format=1

widget with up/down arrows

col=num

number of characters displayed in numeric input area

step=value

step size

sig_dig=num

number of digits to the right of the decimal place with 0 being an integer value

min=value

optional lower bound on input (if supported by Motif)

max=value

optional upper bound on input (if supported by Motif)

num_char=num

optional maximum number of characters allowed on input