Nine panes

Nine white panes in a lattice of red glazing bars that cross without a gap. Five strips in each half, cut straight with bends and an arc in each corner pane; four stretches of every cut lie on top of cuts from the other half, so they do not show, and they are what makes the crossings solid red. The halves mirror each other, so one template covers both, and the difficulty is hard. Cut the hidden stretches exactly on the line, so that no thin edge of the other colour shows through.