[ferret_users] Question about plot the vertical profile

[Ming Yang <myang@xxxxxxxxxxxxx>]

Hi, guys
   I have a question for you. I have a 4D dataset rho (3D in space and 1D 
in time), which is the density of the seawater in the ocean. I want to 
plot the vertical profile of rho at a specific point (say I=9, J=67) and 
at a specific time (L=1). The problem is how can I make the y axis plotted 
as downward positive? I tried to use "SET AXIS/DEPTH", but I always get 
the error message, "**ERROR: invalid command: unknown axis:". Does anybody 
know why? Thank you for your attention.


Best,
Ming