diff --git a/src/Glossary.tex b/src/Glossary.tex
index 230e4d9..b94007b 100644
--- a/src/Glossary.tex
+++ b/src/Glossary.tex
@@ -665,3 +665,7 @@
 % max
 % timestamp
 % frame
+% IOD
+% COSPAR
+% track = tracking mount
+% track = satellite black line drawn on PNG...
diff --git a/src/Upload.tex b/src/Upload.tex
index b15c3ec..23a692e 100644
--- a/src/Upload.tex
+++ b/src/Upload.tex
@@ -191,6 +191,7 @@ The file name is:
         \end{center}
 \end{figure}
 
+
 \subsection{\texttt{unid.png} Unidentified PNG Files}
 \index{FITS}\index{PNG}\index{stvid}\index{NORAD ID}
 As shown previously, \texttt{stvid} will create a new \gls{PNG} with a
@@ -213,3 +214,40 @@ do the same with an unknown satellite track.
         \end{center}
 \end{figure}
 
+
+\subsection{\texttt{.dat} Data Files}
+For each track detected as shown in previous sections, such as for which
+a \gls{PNG} file was created,
+\texttt{stvid} will output a \texttt{.dat} file. The \texttt{.dat} filenames
+corresponding to the figures at \ref{fig:stvid-png-48473-catalog}, \ref{fig:stvid-png-52718-catalog},
+and \ref{fig:stvid-png-90000-unid} are:
+
+\texttt{2022-08-23T04:16:26.633\_48473\_catalog.dat}
+
+\texttt{2022-08-23T04:16:26.633\_52718\_catalog.dat}
+
+\texttt{2022-08-23T04:16:26.633\_90000\_unid.dat}
+
+Note, there is no \texttt{.dat} file created corresponding to the
+\texttt{2022-08-23T04:16:26.633.fits.png} file, since it doesn't show
+detected tracks.
+
+The \texttt{.dat} file contents look like this, for \gls{NORAD ID} 48473:
+
+\texttt{48473 21 040AX  9999 G 20220823041631625 17 25 1533406+483563 37 S}
+
+XXX This is the IOD ? XXX
+
+The first field is the \gls{NORAD ID}. The fourth field looks like COSPAR. XXX
+Large number starting with 2022 is date and time stamp.
+
+The \texttt{.dat} file contents look like this, for \gls{NORAD ID} 52718:
+
+\texttt{52718 22 056C   9999 G 20220823041631625 17 25 1527277+381243 37 S}
+
+The \texttt{.dat} file contents look like this, for the unidentified track
+(the airplane):
+\index{airplane}
+
+\texttt{90000 22 500A   9999 G 20220823041631625 17 25 1457613+535844 37 S}
+
diff --git a/src/figures/stvid/data/2022-08-23T04:16:26.633_48473_catalog.dat b/src/figures/stvid/data/2022-08-23T04:16:26.633_48473_catalog.dat
new file mode 100644
index 0000000..6916b7f
--- /dev/null
+++ b/src/figures/stvid/data/2022-08-23T04:16:26.633_48473_catalog.dat
@@ -0,0 +1 @@
+48473 21 040AX  9999 G 20220823041631625 17 25 1533406+483563 37 S
diff --git a/src/figures/stvid/data/2022-08-23T04:16:26.633_52718_catalog.dat b/src/figures/stvid/data/2022-08-23T04:16:26.633_52718_catalog.dat
new file mode 100644
index 0000000..78d61ad
--- /dev/null
+++ b/src/figures/stvid/data/2022-08-23T04:16:26.633_52718_catalog.dat
@@ -0,0 +1 @@
+52718 22 056C   9999 G 20220823041631625 17 25 1527277+381243 37 S
diff --git a/src/figures/stvid/data/2022-08-23T04:16:26.633_90000_unid.dat b/src/figures/stvid/data/2022-08-23T04:16:26.633_90000_unid.dat
new file mode 100644
index 0000000..36cf982
--- /dev/null
+++ b/src/figures/stvid/data/2022-08-23T04:16:26.633_90000_unid.dat
@@ -0,0 +1 @@
+90000 22 500A   9999 G 20220823041631625 17 25 1457613+535844 37 S