# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0269465         0.0140102    
     0.460000          0.700000         0.0187491         0.0129157    
     0.700000           1.00000         0.0195787         0.0166791    
      1.00000           1.54000         0.0293445         0.0205644    
      1.54000           4.80000         0.0288716        0.00366056    
      4.80000           10.0000         0.0221163        0.00489993