(rank_11, legendre(disc of -N part)) over local graphs of the first 288 srgs: {(20, -1): 17448, (19, 1): 1732, (18, -1): 748, (19, -1): 5252, (16, -1): 48, (17, 1): 24, (15, -1): 128, (18, 1): 336, (17, -1): 204}
