public subroutine field_plane_sums_base(self, sums, f)
Sum a DIR_X field over x and z on every local y-plane:
sums(j) is the sum over the plane of y index j. The order of
summation is fixed, so the result is reproducible.
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Nodes of different colours represent the following:
Solid arrows point from a procedure to one which it calls. Dashed
arrows point from an interface to procedures which implement that interface.
This could include the module procedures in a generic interface or the
implementation in a submodule of an interface in a parent module.
Where possible, edges connecting nodes are
given different colours to make them easier to distinguish in
large graphs.