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S30XL-LESA/LDMX
With calibration enabled, some channels show a non-Gaussian distribution of noise - the sampled ADC value splits into "upper" and "lower" peaks.
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The sequence of "upper" and "lower" events appears to be random.
If one channel group is being calibrated, other channels see crosstalk at ~1/10 amplitude, opposite polarity. This is visible in the plots above.