You can see how the areas of high heat flow in the map above correlate well with the map of gas bubbles recorded on the surface of the lake in 2012. This may seem obvious for a hydrothermal system, but gas plumes are not necessarily accompanied by heat.
This is a map of a heat survey that was undertaken in the 1990s. This week's survey is more detailed and uses a new method, but it will be interesting to see how the results compare. In the earlier survey, areas of heat flow of up to 10 w/m2 were outlined. Some of Maurice's recordings are several times hotter than these.
In this video. Maurice describes the new heat flow survey method: