# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0245743        0.00537685    
     0.460000          0.700000         0.0493976        0.00505005    
     0.700000           1.00000         0.0499850        0.00637014    
      1.00000           1.54000         0.0274830         0.0101200    
      1.54000           2.40000         0.0516534        0.00917475    
      2.40000           10.0000         0.0346390         0.0133272