  Multiple quantum coherences are typically characterised by their coherence
number and the number of spins that make up the state, though only the
coherence number is normally measured. We present a simple set of measurements
that extend our knowledge of the multiple quantum state by recording the
coherences in both the $x$ basis and the usual $z$ basis. The coherences in the
two bases are related by a similarity transformation. We characterize the
growth of the multiple quantum coherences via measurements in the two bases,
and show that the rate varies with the coefficient of the driving term in the
Hamiltonian. Such measurements in non-commuting bases provides additional
information over the 1D method about the state of the spin system. In
particular the measurement of coherences in a basis other than the usual $z$
basis allows us to study the dynamics of the spin system under Hamiltonians,
such as the secular dipolar Hamiltonian, that conserve $z$ basis coherence
number.
