You can use plot, colorbar, colormap, and caxis. You can adjust the line color by setting the Color property of the line object returned by plot.
If you have trouble implementing this, feel free to post a comment about which step exactly is causing you issues, and what you tried to solve it.
The code below was tested on R2011a as well, so it should work for R2013a. Next time, please mention all warnings or errors that you're getting, but most importantly: mention your release. It is 7.5 years old, which in software is very old.
data=xlsread('Pt_data.xlsx');
x=data(:,1);
y=data(:,2:2:end);
z=data(1,3:2:end);
%set z-axis
upper_z=1e-6;
lower_z=1e-9;
%create the colorbar, retrieve the colomap data, and let it match your example image
c=colorbar;
cmap=colormap('jet');
caxis([log10(lower_z) log10(upper_z)])
%set tick positions and create tick labels
Ticks=round(log10(lower_z)):round(log10(upper_z));
TickLabels=arrayfun(@(x) sprintf('10^{%d}',x),Ticks,'UniformOutput',false);
try
set(c,'Ticks',Ticks);
set(c,'TickLabels',TickLabels);
catch %HG1
TickLabels=strrep(strrep(TickLabels,'{',''),'}','');%remove TeX formatting
set(c,'YTick',Ticks);
set(c,'YTickLabel',TickLabels);
end
%normalize the z values to the color scale
z_scaled=(z-lower_z)./(upper_z-lower_z);
z_scaled(z_scaled<0)=0;z_scaled(z_scaled>1)=1;
z_scaled=round(1+z_scaled*(size(cmap,1)-1));%round to nearest index
%plot and select colors from colormap
hold on
for n=1:size(y,2)
C=cmap(z_scaled(n),:);
plot(x,y(:,n),'Color',C);
end
hold off
