6568-20  H alfa narrow set
   2 x 2" both faces coated
   R. Gonzalez  Sept.18, 1993

   W.l       %
   6536     0.23
   6538     0.32
   6540     0.49
   6542     0.65
   6544     0.91
   6546     1.35
   6548     2.13
   6550     3.36
   6552     6.57
   6554    12.10
   6556    24.04
   6558    33.88
   6560    52.05
   6562    62.94
   6564    69.15
   6566    69.81
   6568    68.50
   6570    65.40
   6572    59.58
   6574    47.94
   6576    35.19
   6578    21.67
   6580    12.38
   6582     6.47
   6584     3.61
   6586     2.04
   6588     1.42
   6590     0.99
   6592     0.56
   6594     0.46
   6596     0.35