&GAS: EXTRAPOLATIONS

item

The table item to be extrapolated, the following are known:

Item	Description
`[HIGH-]ATTACHMENT-COEFFICIENT`	Attachment coefficient beyond highest E/p
`[HIGH-]DIFFUSION-TENSOR`	Diffusion tensor beyond the highest E/p
`[HIGH-]DISSOCIATION`	Ion dissociation beyond the highest E/p
`[HIGH-]DRIFT-VELOCITY`	Drift velocity beyond the highest E/p
`[HIGH-]EXCITATION-RATES`	Excitation rates beyond the highest E/p
`[HIGH-]ION-MOBILITY`	Ion mobility beyond the highest E/p
`[HIGH-]IONISATION-RATES`	Ionisation rates beyond the highest E/p
`[HIGH-]LONGITUDINAL-DIFFUSION`	Long. diffusion beyond the highest E/p
`[HIGH-]LORENTZ-ANGLE`	Lorentz angle beyond the highest E/p
`[HIGH-]TOWNSEND-COEFFICIENT`	Townsend coefficient beyond highest E/p
`[HIGH-]TRANSVERSE-DIFFUSION`	Transv. diffusion beyond the highest E/p
`LOW-ATTACHMENT-COEFFICIENT`	Attachment coefficient below first E/p
`LOW-DIFFUSION-TENSOR`	Diffusion tensor below the first E/p
`LOW-DISSOCIATION`	Ion dissociation below the first E/p
`LOW-DRIFT-VELOCITY`	Drift velocity below the first E/p
`LOW-EXCITATION-RATES`	Excitation rates below the highest E/p
`LOW-ION-MOBILITY`	Ion mobility below the first E/p
`LOW-IONISATION-RATES`	Ionisation rates below the highest E/p
`LOW-LONGITUDINAL-DIFFUSION`	Long. diffusion below the first E/p
`LOW-LORENTZ-ANGLE`	Lorentz angle below the first E/p
`LOW-TOWNSEND-COEFFICIENT`	Townsend coefficient below first E/p
`LOW-TRANSVERSE-DIFFUSION`	Transv. diffusion below the first E/p

The prefix HIGH- is optional for backwards compatibility. DIFFUSION can be used instead of LONGITUDINAL-DIFFUSION.

method

The extrapolation method to be used: CONSTANT, EXPONENTIAL or LINEAR.

Constant extrapolation means values for any E/p outside the range of the table are set to the value for the first or last E/p in the table, as appropriate.

In the case of linear and exponential extrapolation the first or last two table points are used as basis for the extrapolation.

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Formatted on 21/01/18 at 16:55.