# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.183436        0.00455370    
     0.460000          0.700000          0.200989        0.00407288    
     0.700000           1.00000          0.231503        0.00467412    
      1.00000           1.54000          0.332407        0.00903959    
      1.54000           2.40000          0.396251         0.0153394    
      2.40000           4.80000          0.421894         0.0212328    
      4.80000           10.0000          0.149515         0.0985435