NCL
                              PD              PI      difference     rel diff(%)
Sources (Tg/yr)         3401.393        3411.262          -9.869          -0.290
        emission        3401.393        3411.262          -9.869          -0.290
Sinks (Tg/yr)           3393.424        3403.430         -10.006          -0.295
         dry_dep        1895.067        1898.787          -3.720          -0.196
         wet_dep        1498.357        1504.643          -6.286          -0.420
Lifetime (days)            0.901           0.894           0.007           0.723
Burden (Tg)                8.377           8.341           0.036           0.431
    accumulation           0.612           0.606           0.006           0.941
          Aitken           0.001           0.001          -0.000          -0.853
          coarse           7.763           7.733           0.030           0.391