# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0875892        0.00298276    
     0.460000          0.700000         0.0980948        0.00266756    
     0.700000           1.00000          0.109004        0.00360051    
      1.00000           1.54000          0.104776        0.00309989    
      1.54000           2.40000          0.101742        0.00340368    
      2.40000           4.80000          0.106624        0.00352660    
      4.80000           10.0000         0.0910477        0.00532558