Comment 2 for bug 1248217

Ah, that seems to work nicely. Gives us this:

Couldn't find a 'val' function in your Python code.
 Python error while setting field: Temperature
 Python string was:
 def Val(X,t):
  depth=1000
  dT=10
  return (X[1]+depth)/depth*dT
*** ERROR ***
Error message: Dying

Are people happy for this to be pushed straight into trunk?