>>> from so2_levels import same_as_first_average

>>> l1 = [ ['bcn-34b', 10.3, -1.0, 11.5, 10, 11, 12.1, -2] ]
>>> same_as_first_average(l1, 0.1)
1
>>> l2 = [ ['bcn-12', 12.4, 11.8, 13.7, -1, 12.09],          # average = 12.4975
...        ['ber-07', 15.9, 14.5],                           # average = 15.2
...        ['ber-10', 12.5, 12.4, 12.6],                     # average = 12.5
...        ['car-66', 12.81, -1, 12.6, -2.3, 15.8, 8.92] ]   # average = 12.5325
>>> same_as_first_average(l2, 0.1)
3
>>> same_as_first_average(l2, 0.005)
2
>>> same_as_first_average(l2, 0.0001)
1
>>> l3 = [ ['tar-99', -1, -1, -1, 12, 12],                     # average = 12.0
...        ['par-7b', 3.6/(0.1+0.1+0.1), 3.6/(0.1+0.1+0.1)],   # average = 11.999999999999998
...        ['sat-14', 12, 13.1, 12.5, -2] ]                    # average = 12.533333333333333
>>> same_as_first_average(l3, 0.001)
2
>>> same_as_first_average(l3, 0.00000000000000001)
1