2, channel 2 digitised from file HIRS_filters.pdf provided by Ronald Glumb (ITT Exelisinc) at  http://ntrs.nasagov/search.jsp?R=19760014184
Number of data points:
51
Wavenumber (cm-1)   Filter response
      656.011000       0.000000
      659.209000       0.000173
      662.108000       0.003190
      664.246000       0.006226
      666.235000       0.010807
      667.468000       0.017719
      668.411000       0.030808
      668.903000       0.046221
      669.890000       0.078589
      670.454000       0.125619
      671.149000       0.163392
      671.398000       0.205803
      672.090000       0.242034
      672.339000       0.284445
      672.611000       0.336880
      672.704000       0.377752
      673.107000       0.420931
      673.662000       0.464105
      673.881000       0.493406
      674.545000       0.517298
      675.215000       0.544275
      675.873000       0.565854
      676.512000       0.578950
      677.146000       0.589732
      677.616000       0.595891
      678.685000       0.597408
      679.138000       0.595855
      679.729000       0.588130
      680.170000       0.581179
      680.606000       0.571914
      681.191000       0.561875
      682.365000       0.542567
      683.521000       0.515548
      684.215000       0.486226
      684.596000       0.453056
      684.687000       0.426061
      685.220000       0.392887
      685.438000       0.355093
      685.808000       0.317295
      686.140000       0.262531
      686.468000       0.206226
      687.098000       0.149142
      687.766000       0.108252
      688.278000       0.065824
      689.130000       0.038812
      690.008000       0.023367
      691.507000       0.013307
      693.170000       0.008641
      694.836000       0.004747
      697.262000       0.000835
      699.846000       0.000000