This excerpt is adapted from Emily Pauline Johnson's 1913 story 'The King's Coin.' Fox-Foot, an Ojibwe man, is leading fur traders by canoe and fears they are being tracked. At supper time, Fox-Foot would allow no fire to be built, no landing to be made, no trace of their passing to be left. As used in the text, what does the word 'trace' most nearly mean?