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Script: theta.gs; Defines potential and equlivalent potential temperature given temperature and moisture inputs

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This script, is really more of a function, the best way to use this would be to copy the contents of this script into the bottom of the script you wish to use it in.  This function reads in temperature and moisture information and returns a good approximation of both potential and equivalent potential temperature.

This function asks for up to four inputs, though only temperature and moisture inputs are required.
It is capable of calculating  equivalent potential temperature given four different moisture input variables:

  1. Relative Humidity (-rh)
  2. Mixing Ratio (-r)
  3. Vapor Pressure (-e)
  4. Specific Humidity (-q)

The default is relative humidity.

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imprun

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set imprun

set imprun script-name

This command sets up automatic execution of a grads script before every display command.

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image output

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Producing Hardcopy and Image Output from grads

grads version 2.1 introduced the use of the Cairo library to handle all the graphics rendering, both for the interactive display in X windows and for the hardcopy and image outputs. The addition of Cairo means that grads can support drawing a wide variety of fonts, smoother looking anti-aliased lines, transparent colors, pattern filling, and more options for graphical output formats. These features provide an opportunity to create some beautifully polished publication-quality graphics. 

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