And the first things that you can see from this graph is, if you look at the blue data points, which are the mechanically ventilated air, they're not simply a subset of the green data points, which are the outdoor air.
O primeiro que vemos no gráfico, se observamos os puntos azuis, que representan o aire ventilado mecanicamente, é que non son un subconxunto do grupo de puntos verdes, que representa o aire exterior.