This widget is a combo-box for 3D probes result.
It allows to choose between three different options:
-   every n time step  : means that every n time step probes results will be written 
in the file having the extension ".his".  
-    each x seconds (in s) : means that every x seconds  a complete result field will be written 
in the file having the extension ".his". A too small value x (with respect to the duration of the 
transient to be simulated), may induce a large number of intermediate probes results (especially with the automatic time step), since interpolated results  may be generated when x is smaller 
than the time step used. 
-   List of instants (in s)  : corresponds to a list of instants (given in seconds - for exemple two hours and 10 hours should be indicated 7200 36000) for which the probes results will be written in a result file having the extension ".his" 
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 SYRTHES version   : VERSION_SYRTHES
 Name help file  : Cb2_3D_Op.html
 I. Rupp, C. Peniguel  -  may 2014
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