# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.175745        0.00426375    
     0.460000          0.700000          0.196068        0.00508641    
     0.700000           1.00000          0.210273        0.00724956    
      1.00000           1.54000          0.240207        0.00972183    
      1.54000           2.40000          0.226221         0.0111241    
      2.40000           4.80000          0.171127         0.0135010    
      4.80000           10.0000          0.203525         0.0203796