Matlab - eliminar eje x sin borrar el grid

plot(time,pres,'.-','color','b')

grid on

set(gca,'FontSize',12,'XTick',[]);

plot(time,temp,'.-','color','g')

grid on

set(gca,'FontSize',12,'XTick',[]);

plot(time,sal,'.-','color','k')

grid on

clear  all

close all

time=sort(rand(1,50));

pres=rand(1,50);

temp=rand(1,50);

sal=rand(1,50);

subplot(3,1,1); plot(time,pres,'.-','color','b')

set(gca,'xticklabel',' ')

%set(gcf,'color', [0.9 0.9 0.9])

%set(gca,'xcolor',[0.8 0.8 0.8])

set(gca,'xgrid','on', 'ygrid','on')

subplot(3,1,2); plot(time,temp,'.-','color','g')

%set(gca,'FontSize',12)

set(gca,'xticklabel',' ')

%set(gcf,'color', [0.8 0.8 0.8])

%set(gca,'xcolor',[0.8 0.8 0.8])

set(gca,'xgrid','on', 'ygrid','on')

subplot(3,1,3); plot(time,sal,'.-k')

grid   on

>> borrar_ejes