When electropalatography is used for speech research, the data from tongue-palate contact is sampled by the controlling computer at up to 100 frames per second. In the early days (when digital displays were less ubiquitous and more limited), the data was printed out on paper for analysis. An example of the printout can be seen in Fig.2, where the sequence runs from top to bottom, and where the 'O' symbol indicates contact and '.' indicates no contact. The utterance shown is 'catkin' /kæt.kɪn/; the sample numbered 344 shows when the /t/ closure is complete, and at frame 350 there is a complete velar closure. The alveolar closure is released at 351. The articulatory overlap (which is inaudible) is thus clearly shown.