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With smappen, you can choose the mode you want to use to create your areas: isochrone (area that can be reached by travelling for a given amount of time with a given mode of transport) and isodistance (area that can be reached by travelling a given distance with a given mode of transport), radius (circle), zip codes, or manual mode (area drawn with the lasso tool). However, there are more sophisticated tools available, which can be used free of charge. You could pick a radius calculator, but this would not allow you to do anything apart from drawing a simple radius map. There are several options for drawing a radius map.
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