Clarify multi column #622

Job	Run time
cs-stan / Coding Standard & Static Analysis	40s
testsuite / testsuite-linux (8.1, highest, false)	32s
testsuite / testsuite-linux (8.2, highest, false)	28s
testsuite / testsuite-linux (8.3, highest, false)	2m 27s
testsuite / testsuite-linux (8.4, highest, false)	1m 29s
testsuite / testsuite-linux (8.1, lowest, false)	29s
	6m 5s

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