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Crosstalk from central two spots of pixel. 1082 hits/spot went to adjacent pixels. 411 hits/spot went to diagonal pixels (27% of crosstalk hits)

Crosstalk from edge six spots. 1539 hits/spot went to adjacent pixels. 523 hits/spot went to diagonal pixels (25% of crosstalk hits) As we expect, we see more crosstalk resulting from the the six spots around the of the pixel and they are slightly more likely to produce hits in the diagonal pixels.

Unchanged

Crosstalk removed ( 3.5% decrease in light for green and clear )

Crosstalk removed and single-ended hits used ( further 10% decrease ) Big decrease due to addition of more low green hits.

Unchanged

Crosstalk removed ( 6.3% increase ) Crosstalk removes spurious hits at beginning and ends of tracks but also improves track finding.

Crosstalk removed and single-ended hits used ( 2% decrease ) Single ended hits causes track finder to pass more short-tracked muons.

Number of crosstalk hits produced per pixel

You can see an optical crosstalk peak at one photoelectron (about 80 ADC's)

50,000 events; all crosstalk hits shown

500,000 events; only clear 'single hit' crosstalk shown

ADC(crosstalk hit)/ADC(source hit)