neighbours within 2.01 d: n=   6  max displacement 0.605 d  |Q20 at 4w| = 0.474 e d^2  |Q10| = 9.0e-18  P(l=2)/P(l=4) = 9.0e+17
neighbours within 2.90 d: n=  66  max displacement 0.605 d  |Q20 at 4w| = 0.879 e d^2  |Q10| = 3.2e-17  P(l=2)/P(l=4) = 3.1e+18
neighbours within 3.50 d: n= 152  max displacement 0.605 d  |Q20 at 4w| = 1.088 e d^2  |Q10| = 3.4e-16  P(l=2)/P(l=4) = 4.7e+18
neighbours within 5.00 d: n= 488  max displacement 0.605 d  |Q20 at 4w| = 0.999 e d^2  |Q10| = 9.3e-16  P(l=2)/P(l=4) = 4.0e+18
neighbours within 7.00 d: n=1392  max displacement 0.605 d  |Q20 at 4w| = 1.007 e d^2  |Q10| = 1.8e-15  P(l=2)/P(l=4) = 4.1e+18
cube alone vs hydrogen (from photon_unit_checks): 2.2e-33 in power
