(Fig 3) Petroleum product concentrations in water samples collected at the Ob...

Positions of the sites are given only on a map and in Fig. 3 in the paper. They were approximated and can a bit differ from real.各观测站点的位置仅在论文的地图及图3中给出。此类位置均经近似处理，或与实际位置存在小幅偏差。