At 1000M0, corresponding to a weak gravitational field, both the QE scheme and the monopole approximation match the exact integrated wavetrain.
Again, a comparison of the gravitational wavetrain found by the exact integrated solution and the QE approximation shows them to be very similar:
These two pictures above show blowups of the graphs at two different times.
At 1000M0, the monopole approximation is valid, and compares well with the exact integrated solution.
Here we see two blowups at different times comparing the monopole approximation and the exact, integrated solution.