# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0177368        0.00163123    
     0.460000          0.700000         0.0183544        0.00153037    
     0.700000           1.00000         0.0190563        0.00170779    
      1.00000           1.54000         0.0207829        0.00179115    
      1.54000           2.40000         0.0212315        0.00209929    
      2.40000           4.80000         0.0177116        0.00274085    
      4.80000           10.0000         0.0170465        0.00403087