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+.help radiooverlay Mar12 votools
+.ih
+NAME
+radiooverlay -- Overlay NVSS radio contours in the image display
+.ih
+USAGE
+radiooverlay image
+.ih
+PARAMETERS
+.ls image
+Input image.
+.le
+.ls size = 0.25
+Field size.
+.le
+.ls ncontours = 0
+Number of contours to be drawn.  If 0, the contour interval may
+be specified, otherwise 20-30 nicely spaced contours are 
+drawn.  A maximum of 40 contours can be drawn.
+.le
+.ls append = yes
+Append the display?
+.le
+.ls verbose = no
+Print actions?
+.le
+.ls device = "imdred"
+Overlay device.
+.le
+.ls status = 0
+Service status code.
+.le
+
+.ih
+DESCRIPTION
+The \fIRADIOOVERLAY\fR task is used to overlay contours from the NVSS 21-cm
+all-sky survey on the image display.  If the \fIimage\fR parameter is an 
+object name, it's position will be resolved and a query for sources within
+\fIsize\fR degrees of that position will be used.  If it is an image name,
+the WCS footprint of the image will be used to generate the query.
+
+The \fICONTOUR\fR task is used to draw the overlays and should be consulted
+to adjust the overlay as desired.
+
+.ih
+EXAMPLES
+1. Display an image of m83 and overlay the NVSS radio contours in the field.
+
+.nf
+  votools> radiooverlay m83 append-
+
+or
+
+  votools> dss m83
+  votools> radiooverlay m83 append+
+.fi
+
+.ih
+REVISIONS
+
+.ih
+SEE ALSO
+nedoverlay, xrayoverlay, obslogoverlay, contour
+.endhelp