# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0106663         0.0176729    
     0.460000           1.54000        0.00840049        0.00269169    
      1.54000           2.40000         0.0182017        0.00249528    
      2.40000           4.80000         0.0321855        0.00271029    
      4.80000           10.0000         0.0279287        0.00318992