mbνc2 = 0.2 eV/c2

0.4

0.8

1.2

1.6

λs (fluid)

0.836

0.836

0.836

0.836

0.836

λs (gas, ν from a−1)

147

114

85.1

71.9

63.5

λs (gas, ν from K.E.)

177

157

137

125

118