pyrcel v2 — updraft ensemble (N=256, mean=0.5 m/s, std=0.25 m/s)
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 S_max  mean=0.352 %  std=0.089 %  min=0.127 %  max=0.634 %
 N_act  mean=5.12e+08 m⁻³  std=1.34e+08 m⁻³
 act_frac  mean=0.512  std=0.134
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Wrote output/ensemble.nc
