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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.
SUBROUTINE ResetEnvironmentCounter
          ! SUBROUTINE INFORMATION:
          !       AUTHOR         Linda Lawrie
          !       DATE WRITTEN   August 2010
          !       MODIFIED       na
          !       RE-ENGINEERED  na
          ! PURPOSE OF THIS SUBROUTINE:
          ! This routine provides an easy method to assure that the environment
          ! counter (used by GetNextEnvironment) is reset before SetupSimulation or
          ! Simulating.  May not be necessary, but just in case.
          ! METHODOLOGY EMPLOYED:
          ! na
          ! REFERENCES:
          ! na
          ! USE STATEMENTS:
          ! na
  IMPLICIT NONE ! Enforce explicit typing of all variables in this routine
          ! SUBROUTINE ARGUMENT DEFINITIONS:
          ! na
          ! SUBROUTINE PARAMETER DEFINITIONS:
          ! na
          ! INTERFACE BLOCK SPECIFICATIONS:
          ! na
          ! DERIVED TYPE DEFINITIONS:
          ! na
          ! SUBROUTINE LOCAL VARIABLE DECLARATIONS:
          ! na
  Envrn=0
  RETURN
END SUBROUTINE ResetEnvironmentCounter