# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000         0.0268164         0.0128933    
      1.00000           2.00000         0.0295915        0.00806523    
      2.00000           10.0000         0.0440945        0.00611538