# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.313632        0.00491619    
     0.460000          0.700000          0.316144        0.00467109    
     0.700000           1.00000          0.303171        0.00688129    
      1.00000           1.54000          0.297009        0.00844752    
      1.54000           2.40000          0.300194         0.0110320    
      2.40000           4.80000          0.256512         0.0138648    
      4.80000           10.0000          0.177321         0.0209339