distance/mm	density/cm^-3
14	892272800000000.0
16	891030000000000.0
18	890409300000000.0
20	889560100000000.0
22	889215900000000.0
24	889060600000000.0
26	888768400000000.0
28	888506900000000.0
30	888416300000000.0
32	888519600000000.0
34	888456100000000.0
36	888432100000000.0
38	888548800000000.0
40	888267000000000.0
42	888211400000000.0
44	888108500000000.0
