# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0378635        0.00832473    
     0.460000          0.700000         0.0704921        0.00865188    
     0.700000           1.00000          0.103591         0.0119499    
      1.00000           1.54000          0.124518         0.0139151    
      1.54000           2.40000          0.104807         0.0215063    
      2.40000           10.0000         0.0905836         0.0418287