6618-20  H alfa narrow set
   2 x 2" both faces coated
   R. Gonzalez  Sept.19, 1993

   W.l       %
   6576     0.19
   6578     0.26
   6580     0.33
   6582     0.33
   6584     0.47
   6586     0.61
   6588     0.89
   6590     1.10
   6592     2.18
   6594     3.93
   6596     6.78
   6598    13.12
   6600    26.71
   6602    40.84
   6604    56.61
   6606    67.16
   6608    71.00
   6610    72.22
   6612    70.31
   6614    66.48
   6616    58.23
   6618    49.50
   6620    32.26
   6622    28.97
   6624    11.17
   6626     6.64
   6628     4.29
   6630     2.45
   6632     1.38
   6634     0.93
   6636     0.66
   6638     0.53
   6640     0.48
   6642     0.39
   6644     0.30
   6646     0.20