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Wire specs, Tensions and grav.sag, distribution of material ...
From the positions, diameters and voltages of the (anode and potential (see picture), cathode and field) wires the electrostatic field in the chamber can be calculated. With a parametrization of the drift velocity as a function of the field strength one can track (charges) outwards from the anodes to calculate isochrones (lines of equal drift times, dimensions in cm):
Some field lines are ending not at the anode but at the potential wires resulting in a corresponding signal loss of about 30%.
Backside views from shutdown 99/00: 1 2
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