Nodes of different colours represent the following:
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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.
public subroutine boundaryflux_advection_diffusion_2d_gpu(fb, fextb, dfavg, nhat, nscale, flux, u, v, nu, N, nel, nvar) bind(c,name="0")