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Bill wrote:

>> My real concern is that I undershoot 4SD perhaps 95% of the time.

Alex replied:

> By how much do you usually overshoot 4SD?

I don't usually overshoot.  If so, it would be very small, .01' to 0.2'

I would have to go back over a  year's data to give you an exact number.
Since I average the groups, individual overshoots get lost in the shuffle. I
cannot remember the last time the average came out as an overshoot.

I do have a goodly number of observations from the batch posted, which had
very tight clusters (all 0.1' SD or better), so I will look at them
individually and try to get you a better answer.

OK, done.  Over 40 observations with sextant vertical and horizontal split
between 63d elevation and 32d elevation, not one pair produced an overshoot.

Combining the largest on and off the arc in each group I get:
63.2', 63.2', 63.2', and 63.2'. (What are the odds of that?) Target 63.2'

Hence my concern.

Bill



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