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Sigma Coordinate Interpolation

Sigma is a vertical coordinate. It is defined as the ratio of the pressure at a given point in the atmosphere to the pressure on the surface of the earth underneath it.
sigma_1.ncl: Converts a 2D shelf model from sigma coordinates to regular coordinates. linint1 is used to linearly interpolate from the sigma coordinates to regular coordinates.

gsn_csm_contour is used to create the slice plot.