BC
                     b.e13.B1850     f.e13.F2000      difference     rel diff(%)
Sources (Tg/yr)            3.385           8.266          -4.881        -144.226
        emission           3.385           8.266          -4.881        -144.226
Sinks (Tg/yr)              3.225           7.946          -4.721        -146.408
         dry_dep           0.922           2.045          -1.122        -121.663
         wet_dep           2.302           5.901          -3.599        -156.323
Lifetime (days)            6.513           5.568           0.946          14.518
Burden (Tg)                0.058           0.121          -0.064        -110.635
    accumulation           0.037           0.092          -0.055        -145.971
  primary_carbon           0.020           0.029          -0.009         -44.749