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\section{Datasets}   \label{sec:datasets}     \subsection{APASS}   \label{sec:apass}     RA (decimal degrees)   RA error (arcsec)   DEC (decimal degrees)   DEC error (arcsec)   nobs (number of observed nights)   V   Verr   B   Berr   g   gerr   r   rerr   i   ierr