def positionMinError(G, vmini, extension=<NUM_LIT:0.0>):
parallaxError = parallaxErrorSkyAvg(G, vmini, extension=extension)<EOL>return _astrometricErrorFactors['<STR_LIT>'].min()*parallaxError,_astrometricErrorFactors['<STR_LIT>'].min()*parallaxError<EOL>
Calculate the minimum position errors from G and (V-I). These correspond to the sky regions with the
smallest astrometric errors.

NOTE! THE ERRORS ARE FOR SKY POSITIONS IN THE ICRS (I.E., RIGHT ASCENSION, DECLINATION). MAKE SURE YOUR
SIMULATED ASTROMETRY IS ALSO ON THE ICRS.

Parameters
----------

G     - Value(s) of G-band magnitude.
vmini - Value(s) of (V-I) colour.

Keywords
--------

extension - Add this amount of years to the mission lifetime and scale the errors accordingly.

Returns
-------

The minimum error in alpha* and the error in delta, in that order, in micro-arcsecond.