# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00221765        0.00494999    
     0.460000          0.700000        0.00567986        0.00339016    
     0.700000           1.00000        0.00319708        0.00512563    
      1.00000           1.54000        0.00816522        0.00331337    
      1.54000           4.80000        0.00852352        0.00303338    
      4.80000           10.0000        0.00348451         0.0122954