# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.562055        0.00815435    
     0.460000          0.700000          0.590358        0.00799074    
     0.700000           1.00000          0.642032         0.0116045    
      1.00000           1.54000          0.720948         0.0204320    
      1.54000           2.40000          0.770424         0.0358009    
      2.40000           4.80000          0.621561         0.0435572    
      4.80000           10.0000          0.440532         0.0647444