# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00758201        0.00235743    
     0.460000          0.700000         0.0457387        0.00255601    
     0.700000           1.00000         0.0231956        0.00308315    
      1.00000           1.54000         0.0329423        0.00333530    
      1.54000           10.0000        0.00692281        0.00248037