And on the morn at underne Sir Arthur was ready in the field with three great hosts.
"Le Morte D'Arthur, Volume II (of II)" by Thomas Malory
Then he departed from them and took his two cousins with him, and so they came unto Camelot by the hour of underne on Whitsunday.
"Chronicle and Romance (The Harvard Classics Series)" by Jean Froissart, Thomas Malory, Raphael Holinshed
Since covariance operators are undern concern within functional PCA, we should ﬁrst of all deﬁne them and give some of their main features.
Local functional principal component analysis