# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0257223        0.00180658    
     0.460000          0.700000         0.0262548        0.00166863    
     0.700000           1.00000         0.0310534        0.00194085    
      1.00000           1.54000         0.0296331        0.00194303    
      1.54000           2.40000         0.0388129        0.00233451    
      2.40000           4.80000         0.0313917        0.00297649    
      4.80000           10.0000         0.0370379        0.00445857