NEC-LIST: Question about Average Gain calculation

 I seem to be doing something wrong...
Here is the relevant part of the input file
RP0,90,180,1001,-90.,0.,2.,2.
Free space,
So I think I'm asking for the Average Gain calculation correctly (the
'1001' bit)

The NEC output says:
   AVERAGE POWER GAIN= 9.34810E+01       SOLID ANGLE USED IN AVERAGING=(
0.0694)*PI STERADIANS.

When I tried this with only a 1 degree increment in (theta, phi) I got
"SOLID ANGLE=0.0000*PI STER"
This seems really odd...
The pattern the file generates looks fine; it is pretty directional
(reflector antenna with hpbw of 5 degrees) but can't imagine why I would
get a zero (or nearly) solid angle.
I am using the NEC2D2K8.exe from the NEC-ARCHIVES website.
Any clues?  Thanks in advance,

Scott Townley
Gilbert, AZ 

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