# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0382870        0.00325569    
     0.460000          0.700000         0.0434323        0.00327918    
     0.700000           1.00000         0.0521050        0.00369459    
      1.00000           1.54000         0.0587801        0.00380075    
      1.54000           2.40000         0.0850853        0.00477291    
      2.40000           4.80000         0.0918551        0.00654467    
      4.80000           10.0000         0.0678135         0.0118694