The $C^{0}_{0}$ (top panel), $\Re C^{1}_{1}$ (middle panel), and $\Im C^{1}_{1}$ (bottom panel) SH components of the charged pion--kaon femtoscopic correlation functions for Pb--Pb collisions at \sqs = 2.76 TeV in the 5--10\% centrality class, positive field polarity. The different charge combinations of pions and kaons are shown with different colours and markers. The statistical and systematic uncertainties are shown as vertical bars and boxes, respectively.