it's not 200 and 350. It is 0.2 and 0.35 That is what "m" means... "mili" or 'one thousandth of'. So, "200 m" means "200 thousandths of", which equals 0.2 In a very busy system you may also get "300 k" which means 300,000 because "k" means "kilo" or 'one thousand times'.