[xmin,xmax,ymin,ymax (,(zmin,)zmax)] to more details, see domdef
boxzoom can have 5 forms:
[vert2], [vert1, vert2],[lon1, lon2, lat1, lat2],
[lon1, lon2, lat1, lat2, vert2],[lon1, lon2, lat1, lat2, vert1,vert2]
INTEGRATION
To make an integral rather than an average
NAN
not a number, we activate it if we want to average without considerate some masked values of TAB.
If masked values of TAB are values consecrated by IDL(!values.f_nan), wr just have to put NAN.
If masked values of TAB are valued a (a must be different of 1, corresponding to nan =
!values.f_nan and of 0, which desactivate nan). We have to put NAN=a.
Comment: In output, rsult points which are NAN will be valued a or !values.f_nan.
NODOMDEF
We activate it if we do not want to pass in domdef even if the keyword boxzoom
is present (like when grossemoyenne is called via checkfield)
WDEPTH
to specify that the field is at W depth instad of T
depth (automatically activated if vargrid eq 'W')