# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0102887        0.00834707    
     0.460000          0.700000         0.0146256        0.00738809    
     0.700000           1.00000         0.0111874        0.00883329    
      1.00000           4.80000         0.0106487        0.00489114    
      4.80000           10.0000         0.0357298        0.00389531