PSE-144 almost maintains its horizontal pattern control down to 250 Hz, with modest midrange narrowing. At very high frequencies the pattern narrows. Around 5 - 7k one can see that there is a difference in the axial and off axis response from around 15 - 40 degrees. This is very useful data to consider in making choices about what to correct in the crossover and how this speaker should be set up in a room.
The horizontal design beamwidth is 80 degrees.
The directivity waterfall plot shows the same data in a different way. The data is shown with the minimum smoothing the software allows (1/12 octave) and here we can see the effectiveness of the dispersion control employed in this horn. The crossover point is not evident in any way.