# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0333155         0.0186456    
     0.460000          0.700000         0.0283981         0.0192188    
     0.700000           2.40000        0.00639383        0.00934272    
      2.40000           4.80000         0.0149611        0.00678571    
      4.80000           10.0000         0.0249984        0.00765661