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In Basecom: Xerr (may be changed)
In DynAstVO: X_error
In Exoplanets: X_error_min; X_error_max
In planets: X_uncertainty
TNOsarecool: X_sigma_plus, X_sigma_minus (to be changed?)
The associated UCDs end with ;stat.error or ;stat.error.min, etc
• Support for PDS3 detached labels (proposal)
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