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Standard parameters, click "simulate" to launch the simulation, move around by dragging the map, zoom with the scrollwheel
start new fires by clicking on "add fire" then the map, add a barrier by clicking "add barried" then the map (at least 3 distant clicks for a polygon)
unchecking the "grid" button will reveal the wind vectors, depending on the processing power of your computer the simulation should run in between 10 seconds and 2 minutes