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.
public pure module function get_estimate_length_scale(this)
Returns estimate_length_scale, the LOGICAL variable
that specifies if a typical length scale, equal to the ratio
of a field over its gradient, should be computed