>>> from mask_avg2 import mask_avg2

---- ini

>>> l = [0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
>>> l2 = [1.0, 3.0, 2.5, 6.2, 4.8, 8.1]
>>> l3 = [0.0, 0.2, 0.4, 0.3, 0.5, 0.1]
>>> mask_avg2(l, l2, l3)
>>> l
[0.5, 1.6, 1.4, 3.2, 2.6, 4.1]


>>> l = [2.0, 2.0, 2.0, 2.0, 2.0, 2.0]
>>> mask_avg2(l, l2, l3)
>>> l
[2.0, 2.0, 2.0, 3.2, 2.6, 4.1]

---- fi