plot_ksi3D(ksimodel,avail,what,Z,tit)

function  plot_ksi3D(ksimodel,avail,what,Z,tit)
%PLOT_ksi3D


% make a new grid with max speed, max Torque and Speed step and Torque step
if not(isnumeric(ksimodel))
Xnew = ksimodel.X;
ksi=ksimodel.ksi;
MAM=ksimodel.MAM;


colors=['.y'
        '.g'
        '.b'
        '.r'];
    howtoplot=cellstr(colors);
amodes=['ZA '
        'MAe'
        'MAn'
        'MAp'];
    
set(text,'fontsize',12)
for i=2:4
    if what(i)==1
        if avail(i)==0
             errordlg(['The ',amodes(i,:),' mode is not available for this pedelec'],'Bad Input','modal');
        else
            hold on
       plot3(Xnew(:,2),Xnew(:,1),ksi(:,i-1)*100,char(howtoplot(i)))
        end
    end
end
grid on
view(150,-30);
axis([0 80 0 25 0 100])
title(tit,'fontsize',14)
ylabel('Speed [km/h]','rotation',30)
zlabel('\xi [%]','rotation',0)
xlabel('T_c [Nm]','rotation',-10)
hold off
else
    errordlg('there are no models found for this assistance mode','Bad Input','modal')
end