They're going into the board. These two sigma bonds are on the plane of the page, on the plane of the board. So if this was the XY axis, that means these two sigma bonds would be on the plane, on the XY plane. Now, one thing you should know about coding single sigma bonds is that these bonds are able to rotate in space. They could rotate 360 degrees around. So since all these guides are sigma bonds, all of these bonds are able to rotate.