head_tail(1:20)
head_tail(1:20, 12)
head_tail(1:20, -7)
head_tail(1:20, -10)
head_tail(letters)
head_tail(sun.spct)
head_tail(sun.spct, 6)
head_tail(sun.data)
head_tail(as.matrix(sun.data))
head_tail(sun_evening.spct)
head_tail(sun_evening.mspct, 1L)
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