# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.489144        0.00490832    
     0.460000          0.700000          0.503987        0.00491240    
     0.700000           1.00000          0.551041        0.00655834    
      1.00000           1.54000          0.705885         0.0107391    
      1.54000           2.40000          0.713044         0.0154057    
      2.40000           4.80000          0.603607         0.0248308    
      4.80000           10.0000          0.459468         0.0421041