Alth4=sqrt(viscC4leith**2*grdVrt+viscC4leithD**2*grdDiv)*L5
Alth4=0. _d 0
Alth4=(viscC4leith*grdVrt+(viscC4leithD*grdDiv))*L5
Alin=viscA4D+vg4*L4+Alth4
Alin=viscA4Z+vg4*L4+Alth4
_RL Alin,AlinMin,AlinMax,Alth2,Alth4,grdVrt,grdDiv