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Steven T. Myers added subsection_Calibrator_Selection_label_sec__.tex
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\subsection{Calibrator Selection}\label{sec:calsources}
The calibration scheme outlined above requires identification of suitable calibration sources. This consists of a list of key Primary and Secondary calibrators for Flux Density and Polarization, as well as a list of Tertiary calibrators across the sky to serve as Gain (mainly phase) calibrators for the target fields.
We use the following terminology to categorize sources:
\begin{itemize}
\item Primary --- well studied and stable sources, with models, suitable for Flux Density and/or Polarization Angle calibration. Includes 3c286 (Prime primary), 3C48, 3C147.
\item Secondary --- a number of sources around the sky that can stand in for Primary calibrators or for bandpass or leakage, monitored and linked to the Primaries.
\item Tertiary --- the larger grid of suitable B-configuration S-band Gain calibration sources, largely drawn from the VLA Calibrator list. Some of these will have positions with {\it astrometric} accuracy positions.
\end{itemize}
From the lists, calibrators will be assigned to each observing Tile and stored in the database for access by the scheduling software.
