# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0816697        0.00504181    
     0.460000          0.700000         0.0789946        0.00458371    
     0.700000           1.00000         0.0589385        0.00546929    
      1.00000           1.54000         0.0715219        0.00473335    
      1.54000           2.40000         0.0548448        0.00676779    
      2.40000           10.0000         0.0352493        0.00702168