# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.270152        0.00518157    
     0.460000          0.700000          0.276004        0.00487912    
     0.700000           1.00000          0.273520        0.00697922    
      1.00000           1.54000          0.264287        0.00711142    
      1.54000           2.40000          0.251130        0.00818127    
      2.40000           4.80000          0.221362        0.00952961    
      4.80000           10.0000          0.136722         0.0144094