This problem comes up sometimes, for instance when there are multiple variables that are each available with a different number of vertical levels (some variables are cut off at the top?). In that case usually you'd only want the lower levels where all variables are defined. If you happen to know what that lowest cutoff is, then that bound can be enforced with an appropriate --filter option, but it would be easier if this particular condition could be done with its own option.
This problem comes up sometimes, for instance when there are multiple variables that are each available with a different number of vertical levels (some variables are cut off at the top?). In that case usually you'd only want the lower levels where all variables are defined. If you happen to know what that lowest cutoff is, then that bound can be enforced with an appropriate
--filteroption, but it would be easier if this particular condition could be done with its own option.