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+.help ringavg Nov02 proto
+.ih
+NAME
+ringavg -- compute pixel averages in concentric rings about given center
+.ih
+USAGE
+ringavg image xc yc
+.ih
+PARAMETERS
+.ls image
+Image to be used.
+.le
+.ls xc, yc
+Pixel coordinate for center of rings.
+.le
+.ls r1 = 0, r2 = 10, dr = 1
+Rings to be measured.  \fIr1\fR is the inner radius of the first ring,
+\fIr2\fR is the outer radius of the last bin, and \fIdr\fR is the widths
+of the rings.  The values are in units of pixels.
+.le
+.ls labels = yes
+Print column labels for the output?
+.le
+.ls vebar = no
+If \fIvebar\fR is yes then the standard deviation and standard error will
+be printed as negative values for use with \fBgraph\fR.
+.le
+.ih
+DESCRIPTION
+Pixels are binned into a series of concentric rings centered on a given
+position in the input image.  The rings are defined by an inner radius
+for the first ring, an outer radius for the last ring, and the width
+of the rings.  The statistics of the pixel values in each ring are then 
+computed and list to the standard output.  The output lines consist
+of the inner and outer ring radii, the number of pixels, the average value,
+the standard deviation of the value (corrected for population size), and
+the standard error.  The parameter \fIlabel\fR selects whether to include
+column labels.
+
+If the ring average are to be plotted with the task \fBgraph\fR using
+the option to plot error bars based on the standard deviation or standard
+error then the \fIvebar\fR parameter may be set to write the values as
+negative values are required by that task.
+
+This task is a script and so users may copy it and modify it as desired.
+Because it is a script it will be very slow if r2 becomes large.
+.ih
+EXAMPLES
+1. Compute the ring averages with labels and output to the terminal.
+
+.nf
+    cl> ringavg pwimage 17 17
+    #  R min    R max     Npix    Average    Std Dev    Std Err
+	0.00     1.00        5      7.336       9.16      4.096
+	1.00     2.00        8     0.2416     0.2219    0.07844
+	2.00     3.00       16     0.3994     0.5327     0.1332
+	3.00     4.00       20    0.06211    0.05491    0.01228
+	4.00     5.00       32     0.0987    0.08469    0.01497
+	5.00     6.00       32    0.06983    0.06125    0.01083
+	6.00     7.00       36     0.0641     0.0839    0.01398
+	7.00     8.00       48    0.06731    0.05373   0.007755
+	8.00     9.00       56    0.06146    0.07601    0.01016
+	9.00    10.00       64    0.05626    0.05846   0.007308
+.fi
+
+2.  Plot the ring averages with standard errors used for error bars.
+
+.nf
+    cl> ringavg pwimage 17 17 label- vebar+ | fields STDIN 2,4,6 |
+    >>> graph point+ marker=vebar
+.fi
+
+3.  Plot ring averages for galaxy in dev$pix.
+
+.nf
+    cl> ringavg dev$pix 256 256 r2=100 dr=5 label- | fields STDIN 2,4 |
+    >>> graph logy+
+.fi
+
+.ih
+SEE ALSO
+pradprof, psfmeasure, radprof
+.endhelp