Box and whisker plot showing m/z 35 when comparing high risk to low risk faecal headspace samples for colorectal cancer with the H<sub>3</sub>O<sup>+</sup> precursor ion. A BattyClaire CauchiMichael LourençoCélia O HunterJohn TurnerClaire 2015 <p>CPS = counts per second, LR = low risk, HR = high risk.</p>