The value is defined in user scale units for Log
and Linear axes. For Text
and Ordinal axes,
this value is an ordinal starting with 1.0. For Date
axes, this value is in XL Date format (see XDate, which is the
number of days since the reference date of January 1, 1900.
Remarks
This value can be set
automatically based on the state of MinAuto. If
this value is set manually, then MinAuto will
also be set to false.