Remove YLabel and show the variation between marks

Hi,

I have to plot a graph which cannot show the y label. However, I would like to show the variation between marks like the image below.

In order to remove the y label I will use the (set(gca, 'YTickLabel', []);), which will work fine, but to show the variation ("10 dB") I don't really know a way to make it easier than I've done so far:

(text(63,55,['\}'],'HorizontalAlignment','center', 'EdgeColor','none', 'FontName', 'Courier New', 'FontSize', 70);

text(68,55,['10 dB'],'HorizontalAlignment','center', 'EdgeColor','none', 'FontSize', 10);)

Does anyone know how to do it? The way I did works, but since the number os graphs I will have to plot is high I would like to make it easier than manually.

Regards,

Maicon