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According to the page, this is valid for the 220.127.116.11.5401 version or higher. However here are things to keep in mind when replacing the <amount>:
Create a BAT file and add java -Xmx<amount> -jar /path/to/the/triplea.jar, then run the file.
java -Xmx<amount> -jar /path/to/the/triplea.jar