I have 9 pgfplots plots(or tikz figures) and I want to put them in a grid of 3x3 i.e. 3 rows and 3 columns. So each of the 3 rows, contain 3 figures side by side horizontally. How to achieve this ?
Secondly, all these plots have same legend entries. I don't want to put them inside the figure. I know, how to place them outside but 9 outside legend entries will consume a lot of page space which is completely unnecessary as all of them are same. I just want a single legend entry for all plots. It may be placed at any convenient position (but I prefer top or bottom, for more clarity).