# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0295565         0.0320685    
     0.460000          0.700000         0.0544951         0.0275210    
     0.700000           1.00000         0.0488980         0.0265921    
      1.00000           1.54000         0.0400450         0.0223143    
      1.54000           2.40000         0.0527066         0.0195360    
      2.40000           4.80000         0.0995995        0.00927916    
      4.80000           10.0000         0.0806125        0.00893912