(1) if phi4[1] = {1} ; settable(t4, 1, phi4) ; tssub(t4,1,4) "4 is moduloval" ==> t4 will be {0}
(2) if phi4[1] = {0} ; settable(t4, 1, phi4) ; tssub(t4,1,4) ==> without the moduloval "4", t4 would be {-3}, with the moduloval "4", t4 will actually be {1}
The moduloval "4" is to keep the phases quadrature.
being 0,1,2 or 3.
Typically, phases (0,1,2,3) mean (0,90,180,270), similar with the phases in Bruker