  We have measured the diffracted neutron scattering intensities from the
square magnetic flux lattice in the perovskite superconductor Sr$_2$RuO$_4$,
which is thought to exhibit p-wave pairing with a two-component order
parameter. The relative intensities of different Bragg reflections over a wide
range of field and temperature have been shown to be inconsistent with a single
component Ginzburg-Landau theory but qualitatively agree with a two component
p-wave Ginzburg-Landau theory.
