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Asymmetric Errors
TXT2AST currently provides the only means of getting asymmetric
axis and data errors into ASTERIX applications. This is achieved
using the LO/UPWIDTH and/or LO/UPERROR descriptors to describe
the axis and data error bars respectively. See the "Asymmetric
Errors" under the examples sub-topic for a demonstration of
these descriptors.
An alternate pair of descriptors for settings lower and upper
data errors is LOLIM/UPLIM. Here the data columns should specify
the lower and upper error bounds, rather than the sizes of the
errors themselves. TXT2AST converts the bounds to errors using the
value of the corresponding DATA element.
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