# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00521605        0.00750870    
     0.460000          0.700000         0.0141789        0.00477759    
     0.700000           1.54000        0.00839596        0.00431134    
      1.54000           2.40000         0.0159609        0.00731824    
      2.40000           4.80000        0.00383112         0.0152144    
      4.80000           10.0000         0.0297818         0.0127742