The percent sign % or degree sign ° should always be specified in OSM, otherwise the risk of ambiguities is too high. Anyway, on scientific side, if you express a ratio in percentage you must always postpone the % sign. Ratio is a pure number, true, but if you don't use the % notation, 10% must be written 0.10, 15% becomes 0.15 and 100% becomes 1.00. If you write 10 without % it does not mean a ratio of 10% but 1000%. Bye Alberto
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