# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0446837        0.00540479    
     0.460000          0.700000         0.0423831        0.00519151    
     0.700000           1.00000         0.0366042        0.00658749    
      1.00000           1.54000         0.0415820        0.00526186    
      1.54000           2.40000         0.0632171        0.00509157    
      2.40000           4.80000         0.0910173        0.00429503    
      4.80000           10.0000         0.0756919        0.00450777