\documentstyle [adc,11pt]{article}
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\newcommand{\dmv}{Documentation for the Computer-Readable Version}
\newcommand{\cat}{Improved CCD Standard Fields}
\newcommand{\abbr}{CCDF}
\newcommand{\catref}{Odewahn {\em et al} 1992}
\newcommand{\pcatref}{Odewahn, S. C., Bryja, C., and Humphreys, R. M.}
\newcommand{\docnum}{NSSDC/WDC-A-R\&S 92-12}
%
\begin{document}
%
\title{\cat}
\author{(\pcatref)}
\docauthor{Nancy G. Roman}
\docno{NSSDC/WDC-A-R\&S 93-12}
\date{March 1993}
\maketitle

\begin{abstract}

The authors have combined multiple nights of CCD observations of NGC 7790, NGC
7006, and NGC 4147 in order to establish deep sequences of photometric
standards whose errors have been objectively derived through statistical
comparisons. Values are given for B, V, and R for stars in the magnitude range
12.8 to 20.2.

\end{abstract}

\section{Introduction}

This document describes the indigenous characteristics of the machine-readable
version of the {\em Improved CCD Standard Fields} to a computer. {\bf A copy
should be transmitted with any additional copy of this catalog.}

\section {Source Reference}

\begin{references}

\item ``Improved CCD Standard Fields'' Odewahn, S. C., Bryja, C. and
Humphreys, R. M. 1992, PASP, 104, 553

\end {references}

\section {Structure}

\subsection{File Structure}

The {\em Improved CCD Standard Fields} as distributed here is in a single fixed
block file. It contains 273 records of 80 bytes each. The four tables in the
printed paper have been concatenated into one with the SGP field first, followed
by F401 and with all data for each quasar on a single line.

\pagebreak

\subsection{File Format}
Table 1 gives a byte-by-byte description of the contents
of the data file.
\begin{table} [h]
\begin{center}
\begin{tabular}{ c c c l }
\hline
&  &  &    \\
Bytes     & Unit   &Format & Item                              \\ \hline
 1 -  8   &        & A8    & Cluster Name  \\
11 - 13   &        & I3    & Star Number \\
15 - 19   & pixel     & F5.1   & X (plate coordinate)  \\
21 - 25   & pixel     & F5.1   & Y  (plate coordinate) \\
29 - 34   & mag    & F6.3   & V \\
37 - 41   & mag    & F5.3   & m.e.(V) \\
43 - 44   &        & I2     & No. Obs. (V) \\
47 - 52   & mag    & F6.3   & B$-$V   \\
55 - 59   & mag    & F5.3   & m.e. (B$-$V) \\
61 - 62   &        & I2     & No. Obs. (B$-$V) \\
65 - 70   & mag    & F6.3   & V$-$R  \\
73 - 77   & mag    & F5.3   & m.e. (V$-$R) \\
79 - 80   &        & I2     & No. Obs. (V$-$R)  \\
\hline
\end{tabular}
\caption{Format }
\end{center}
\label{T:form}
\end{table}

Note: X is positive to the west; Y is positive to the north.

\section{References}
\begin{references}
\item Odewahn, S. C., Bryja, C., and Humphreys, R. M. 1992, PASP, 104, 553
\end{references}
\end{document}
