Log4j different appenders for different log levels using properties file

Since the official documentation for log4j is a broken link, and the getting started guide isn't helping me, I would like to know how to use two appenders with different log levels for the same logger, using a .properties file instead of an .xml one.

For example, like this:

log4j.rootLogger=debug,  APPENDER_FILE, APPENDER_STDOUT

I'm logging with two different appenders, but on the same log level (DEBUG). I would like to use an INFO log level for APPENDER_STDOUT, and aDEBUG log level for APPENDER_FILE.

My question is similar to this, but unlike that question, I'm using the log4j.properties file, not the xml file.