True if and only if the coordinate is a CF X axis coordinate.
See also
ctype, T, Y, Z
Whether or not the coordinate is a X axis coordinate.
>>> c.Units <CF Units: degreeE> >>> c.X True
>>> c.standard_name 'longitude' >>> c.X True
>>> c.axis 'X' >>> c.X True
cf.DimensionCoordinate.varray
cf.DimensionCoordinate.Y
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