Following on with the polarity finder techniques, would you give us some reference voltages for a typical residential transformer?

Assuming that X0 is bonded to H2 (= 0 V), H1 to H2&X0 = 7200 V, X1 to X0 = 120 V, X2 to X0 = 120 V, X1 to X2 = 240 V, what are the following voltages:

1. H1 to X1?
2. H1 to X2?