A removable player station and locking mechanism. The conductive path 8 is contacted in a sliding manner by a contact element. Then, peripheral driving circuits are provided in regions where the interference fringes exist and a pixel matrix circuit is disposed in a region where no interference fringe exists. The second fluid circuit is adapted to communicate a second fluid from a second inlet to a second outlet. Optionally, the coating formulation may contain an optical brightening agent, a defoamer and a thickener. The external chamber can be connected to the heat pipethermo siphon via a conduit which connection point is placed above liquid level at a evaporating end of the heat pipethermo siphon and in that the external chamber is arranged below the connection between the conduit and the heat pipethermo siphon.