Custom RRD graphs

[Stuffle, David]

Hello,
I'm trying to learn how to create custom graphs.  I have it working for
graphing license usage but I'm am not clear on a few things.  Here is what I
put in the hobbitgraph.cfg:
 
[license]
        TITLE License Utilization
        YAXIS Used Licenses
        DEF:avg=license.rrd:license:AVERAGE
        LINE2:avg#@COLOR@:Used Licenses
        GPRINT:avg:LAST: \: %5.1lf (cur)
        GPRINT:avg:MAX: \: %5.1lf (max)
        GPRINT:avg:MIN: \: %5.1lf (min)
        GPRINT:avg:AVERAGE: \: %5.1lf (avg)\n
 
 
My question is, what does AVERAGE mean in the DEF line?  What other options
are there besides AVERAGE?
 
Also, the license count will always be a whole number from say, 0 to 30.
Sometimes my graph shows, for example, 3.6 licenses used.   Is there an
option I need to add to tell it to always use a whole number?  My custom_rrd
script doesn't send anything except a whole number. 
 
Thanks for any help.
 
David Stuffle
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