A time capnogram may be recorded at two speeds.  A high speed capnogram (about 7mm.sec^-1) gives detailed information about each breath whereas the overall CO₂ changes (trend) can be followed at a slow (about 0.7 mm.sec^-1) speed.¹

^{Reference:     Bhavani Shankar K, Moseley H, Kumar AY, Delph Y. Capnometry and anaesthesia. Can J Anaesth 1992;39:6:617-32.}