# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.157185        0.00346872    
     0.460000          0.700000          0.154358        0.00359180    
     0.700000           1.00000          0.132407        0.00475352    
      1.00000           1.54000          0.116896        0.00528805    
      1.54000           2.40000          0.101052        0.00696977    
      2.40000           4.80000          0.106952        0.00954882    
      4.80000           10.0000          0.102016         0.0153605