# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.449676        0.00416877    
     0.460000          0.700000          0.463678        0.00469587    
     0.700000           1.00000          0.359785        0.00523284    
      1.00000           1.54000          0.397839        0.00621411    
      1.54000           2.40000          0.461371        0.00709979    
      2.40000           4.80000          0.401321        0.00790951    
      4.80000           10.0000          0.335370         0.0100076