# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0323384        0.00401152    
     0.460000          0.700000         0.0413726        0.00470221    
     0.700000           1.00000         0.0403168        0.00448591    
      1.00000           1.54000         0.0348192        0.00468447    
      1.54000           2.40000         0.0396909        0.00603463    
      2.40000           10.0000         0.0189957        0.00675802