Really, it is pretty close to NOS, which is 90 degrees, 30cm. I ran NOS with my km184s alot and really liked it as a pattern for them.
As an aside: I also ran my km184s alot with a modified NOS pattern with 30cm spacing and 75-80 degrees separation in poorer sounding rooms. A good solution when you might want hypers but are stuck with the fixed cards. The smaller angle takes out more of the room boom/reverb and gives you a better audio signal:crowd noise ratio since you are more direct on the stacks. But the larger NOS spacing still works to preserve the soundfield and stereo separation, which gets diminished with the smaller angle.