sdfopen /net2/mjn/model.slp.nc
set lat 0
q dims
define a=slp
set x 1 144
q dims
define b=slp
set lon 1.25 358.75
q dims
define c=slp
set x 30
d a
d b
d c
d a(x=30)
d b(x=30)
d c(x=30)
d a-b
d a(x=30)-b(x=30)
d a-c
d a(x=30)-c(x=30)
d b-c
d b(x=30)-c(x=30)
