Plot two graphs inside a loop and link markers with lines

I am trying to plot a line plot for two graphs inside a for loop. The scatter plot working but the line plot is not working. Also I want to link the markers with the lines in a increasing manner. Would like to get some help if possible.

for i = 1:5:49
    scatter(T -i*dt,expt_bls(:,i),25,'b');
    title('Exposure vs Time','Fontsize',12,'Fontweight','bold','Color','k');
    xt = get(gca, 'XTick');
    yt = get(gca, 'YTick');
    set(gca, 'FontSize', 12)
    xlabel('Time')
    ylabel(Exposure')
    hold on
    scatter(T - i*dt,expt_reg(:,i),25,'r');
    legend('BS','Regression');    
end

[David Fink]

What do you mean by "link the markers with the lines in an increasing manner"? There are a bunch of properties you can modify, including marker color, line color, marker size, and line width.