Add a new outputmode for an at export in GaugeDischargeCurveArtifact The data provided by the GaugeDischargeCurveArtifact can be used for displaying a curve and also for an at file. Therefore provide another output mode that for a at export.

SYMBOLSET
SYMBOL
  NAME 'point'
  TYPE ELLIPSE
  POINTS
    1 1
  END
  FILLED TRUE
END
SYMBOL
  NAME "square"
  TYPE VECTOR
  POINTS
    0 0
    0 1
    1 1
    1 0
    0 0
  END
  FILLED TRUE
END
END