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SUBROUTINE GRFEB (DXM,X,DXP, DYM,Y,DYP, DELTAX, DELTAY,
X PL2)
C$ (Error Bars)
C$ Draw horizontal and/or vertical error bars at a point. The
C$ bar is suppressed if its end coordinates are identical. A
C$ vertical error bar terminates at short horizontal bars.
C$ Horizontal error bars are similarly terminated by short
C$ vertical bars. The arguments are:
C$
C$ DXM............Minus X error bar. If positive, it
C$ represents an absolute error; if negative, a
C$ relative error.
C$ X..............X coordinate of point.
C$ DXP............Plus X error bar. If positive, it
C$ represents an absolute error; if negative, a
C$ relative error.
C$ DYM............Minus Y error bar. If positive, it
C$ represents an absolute error; if negative, a
C$ relative error.
C$ Y..............Y coordinate of point.
C$ DYP............Plus Y error bar. If positive, it
C$ represents an absolute error; if negative, a
C$ relative error.
C$ DELTAX.........Fraction of window width to be used for
C$ terminating horizontal bars on the vertical
C$ error bar. Recommended values are in the
C$ range 0.0..0.01.
C$ DELTAY.........Fraction of window height to be used for
C$ terminating vertical bars on the horizontal
C$ error bar. Recommended values are in the
C$ range 0.0..0.01.
C$ PL2CA..........2-D pen movement routine, usually PL2CA.
C$
C$ The coordinates of an absolute error bar are X-DXM..X+DXP
C$ and Y-DYM..Y+DYP. For a relative error bar, they are X*(1
C$ - abs(DXM))..X*(1 + abs(DXP)) and Y*(1 - abs(DYM))..Y*(1 +
C$ abs(DYP)). It is permissible to use both absolute and
C$ relative error specifications in a single call.
C$ (25-MAR-82)