the critical property (e.g., L for transistors) is required to
match exactly between devices in order to allow the additive
property (e.g., W for transistors) to be summed. The critical
property should match if all values are within the slop value,
for floating-point values. Note: The implementation is still
not rigorous, as the saved critical value may shift from
device to device; so comparing, e.g., 1.00 to 1.01 to 1.02 to
1.03, etc., can find that all individual comparisons are within
the slop value even though the slop is exceeded across all values.
Tim Edwards
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