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Routine
psmile_extent_subgrid_1d_dble (array, idlow, idhigh, nbr_corners,
ibeg, iend, extent, ierror)
Subroutine "PSMILe_Extent_Subgrid_1d_dble" computes the
extent of the subgrid contained in array (ibeg:iend, nbr_corners).
idlow, idhigh, nbr_corners, ibeg, iend, array = in
extent, ierror = out
used for directions where the grid is regular.
takes the min and max coordinates (based on the corners) in the
considered direction.