Isobars are a type of contour map (maps that use isolines) that is used to show changes in air pressure. Measured in millibars, the further away each line is from the other, the greater the change in air pressure. Pictured above is a cold front over Australia where the high pressure area is denoted with a H and low pressure with a L.
http://hsc.csu.edu.au/primary_ind/prim_ind_240/compulsory/AHCWRK201A/3264/reading_weather_maps.htm
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