# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0726754        0.00473032    
     0.460000          0.700000         0.0766670        0.00444704    
     0.700000           1.00000         0.0758760        0.00599440    
      1.00000           1.54000         0.0866561        0.00635007    
      1.54000           2.40000         0.0839261        0.00918409    
      2.40000           4.80000         0.0835717         0.0125477    
      4.80000           10.0000          0.116772         0.0189383