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XPLUS(*).....Plus error bar values for X data. Error bars are placed
every NU(K) points on curve K, just like markers.
Positive entries in XPLUS(*) represent absolute errors,
and negative entries relative errors. They are applied
***AFTER*** any scaling and translation are done on the
input points. On curve K, a horizontal error bar will be
drawn between X(I,K) - ABS(XMINUS(K)) and X(I,K) +
ABS(XPLUS(K)) for absolute errors, or between X(I,K)*(1.0
- ABS(XMINUS(K))) and X(I,K)*(1.0 + ABS(XPLUS(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.