NCL
                     b.e13.B1850     f.e13.F2000      difference     rel diff(%)
Sources (Tg/yr)         3998.556        3788.115         210.441           5.263
        emission        3998.556        3788.115         210.441           5.263
Sinks (Tg/yr)           3998.389        3787.571         210.818           5.273
         dry_dep        1207.712        1155.895          51.817           4.291
         wet_dep        2790.677        2631.676         159.001           5.698
Lifetime (days)            1.147           1.134           0.013           1.142
Burden (Tg)               12.561          11.763           0.798           6.354
    accumulation           0.610           0.569           0.041           6.697
          Aitken           0.002           0.001           0.000           4.380
          coarse          11.950          11.193           0.757           6.337