“…The results showed that the high front vowel pair is reliably distinguished by F1: the long /iː/ has a smaller F1 than the short /ɪ/, by 2 ERB, a difference which by far exceeds the just noticeable difference for formants (which is 0.2 ERB for [ɪ]-like vowels, Kewley-Port, 1995).The significant lowering of the short /ɪ/ in the vowel space is further documented by this vowel being, in terms of F1, four times closer to the short mid back /o/ than the long /i:/ is to the long mid /o:/. This F1 distinction between /ɪ/ and /iː/ is in line with previous acoustic measurements of vowels from read speech (Skarnitzl & Volín, 2012;Šimáčková et al, 2012;Paillereau, 2016) and matches the impressionistic observations of spontaneous speech from the 20th century (Frinta, 1909(Frinta, , 1924Beneš, 1943;Chlumský, 1928;Hála, 1955; note that Hála, 1941Hála, , 1962 noticed an openess not only of the short but also of the long front high vowel).…”