Inclusive $\jpsi$ polarization parameters as a function of transverse momentum for Pb--Pb collisions at $\ensuremath{\sqrt{s_{_{\mathrm{NN}}}}}=$ 5.02 TeV, compared with results obtained in pp collisions by ALICE at $\ensuremath{\sqrt{s}}=$ 8 TeV and by LHCb for prompt $\jpsi$ at $\ensuremath{\sqrt{s}}=$ 7 TeV (the LHCb markers were shifted horizontally by +0.3 GeV/c for better visibility) in the rapidity interval $3< y the="" error="" bars="" represent="" total="" uncertainties="" for="" pp="" results="" while="" pb--pb="" statistical="" and="" systematic="" are="" plotted="" separately="" as="" a="" vertical="" bar="" shaded="" box="" respectively.="" in="" left="" part="" of="" plot="" polarization="" parameters="" helicity="" reference="" frame="" reported="" right="" those="" collins-soper="" frame.="">< /y>