# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0498348        0.00522375    
     0.460000          0.700000         0.0334621        0.00505746    
     0.700000           1.00000         0.0408226        0.00606637    
      1.00000           1.54000         0.0534217        0.00670642    
      1.54000           2.40000         0.0574329        0.00823245    
      2.40000           4.80000         0.0577474         0.0115447    
      4.80000           10.0000         0.0628818         0.0200029