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YPLUS(*).....Plus error bar values for Y data. Error bars are placed
every NU(K) points on curve K, just like markers. They
are applied ***AFTER*** any scaling and translation are
done on the input points. Positive entries in YPLUS(*)
represent absolute errors, and negative entries relative
errors. On curve K, a vertical error bar will be drawn
between Y(I,K) - ABS(YMINUS(K)) and Y(I,K) + ABS(YPLUS(K))
for absolute errors, or between Y(I,K)*(1.0 -
ABS(YMINUS(K))) and Y(I,K)*(1.0 + ABS(YPLUS(K))) for
relative errors. This does not offer the luxury of
individual error bars for each point, but on the other
hand, requires only 4 extra numbers for each curve, rather
than for each point, if both X and Y error bars are to be
drawn.