[kinetic (Steve)]

Ok, after a few more hiccups and a week of gusty gully breezes
messing with PE refinement, I finally got a few sets to look at
in Excel and redid the PEC array in the Bartel drive.

The final night was above average seeing which helped a lot
to both quantify and test the PE.
My index point has now changed and I have to remember this when
I engage the error correction.

First pic is a few PE sets overlaid with the same index entry point.
You can see a bit of deliberate RA rate error (the downhill slope) on
all of them.

The next set is the result of half a dozen PE sets averaged and smoothed,
then fed into the Bartels PEC array. This set has zero RA error and
represents 2 complete cycles of the RA worm with PEC ON ,
then lastly , 1 complete RA worm cycle with it off.

I haven't worked out how to adjust all Excel values up and down so they
dip above and below zero (simple Excel maths formula stuff!) so I added
a line at value 18 because this is the index start.
So for all illustrative purposes this line represents zero.
Reading this it seems I have about +/- 4 pixels error in RA with Pec
turned on and +25 / - 18 pixels with it off.
At 1.14 arc sec per pixels this represents no larger than +/- 5 arc sec
of PE with it turned on. Now that got my attention because previously
I could only get it under +/- 10 on a good night and +/- 15 on average
nights when close to the celestial equator.

Pic 3 is a close up crop of centre stars in Omega Centauri with PEC
turned on.

Steve