# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0253578         0.0145756    
     0.460000          0.700000         0.0172281         0.0150559    
     0.700000           1.00000         0.0637623        0.00693239    
      1.00000           1.54000         0.0767679        0.00241769    
      1.54000           2.40000         0.0755270        0.00166287    
      2.40000           4.80000         0.0755327        0.00138064    
      4.80000           10.0000         0.0685617        0.00176846