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Signification of a LAG :
The value of the LAG index must be
expressed in ``number of seconds''; its value is automatically added
to the prism_put_proto date value and the sending
effectively performed when the sum of the date and the lag
integer number of coupling periods. This sending action is
automatically matched, on the
target side, with the receiving action
performed when the prism_get_proto date argument equals the
same integer number of coupling periods.
When LAG=0 there
are no restart files
LAG > 0 there are restart files and the models both call a
prism_get_proto before their prism_put_proto.
As the fields have not been calculated by the source model as t=0, the
field is read from a restart file.
Note that when there is a lag, the first instance of the
is missing in the debug file because the first source field is not
sent by the source model with
a prism_put_proto but directly
read by OASIS3 from the coupling restart file.