# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.264620        0.00347026    
     0.460000          0.700000          0.273463        0.00402743    
     0.700000           1.00000          0.336029        0.00538960    
      1.00000           1.54000          0.328019        0.00655429    
      1.54000           2.40000          0.304499        0.00686839    
      2.40000           4.80000          0.246666        0.00831081    
      4.80000           10.0000          0.204285         0.0107500