SUBROUTINE TSTEP  Author  : Marc, 3l50
 Date    : April 2003
 Modified:

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 What it does
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Takes an adiabatic timestep in spectral space either a centred semi-implicit timestep for KOUNT>KITS or an initial short timestep for KOUNT

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 Structure of Routine
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 Program calls
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Called by Calls
IGCM3 (summ) SGEMM
MATINV (summ)

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