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Text File Format
COMSOL Multiphysics text file, using the file extension .mphtxt, are text files where values are stored as text separated by whitespace characters.
Lexical conventions:
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Strings are serialized as the length of the string followed by a space and then the characters of the string, for example, “6 COMSOL”. This is the only place where whitespace matters.
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The software ignores everything following a # on a line except when reading a string. This makes it possible to store comments in the file.