Unlike with enlarged dolmens the setup of orientation lines seem to follow a parallel pattern. The gaps between the stones are used for them, which are absent in enlarged dolmens. In that way one could talk about different orientation cultures. As stated on the page D22 and enlarged dolmens, D22 seems to be a mixture of both cultures. Since D22 forms a pair with D21 and this dolmen has clear parallel orientation lines, it was expected to be profitable to study both in detail.
Dolmen D21 has an orientation of 43º along the side walls. The side stones stand stricktly in a line, so there is no doubt about the orientation. Between the side stones four parallel orientation lines run at an azimuth of 167º. Only one line is not running free through a gap. It goes through an edge of side stone Z1, but during a restoration this stone has been put on end again by van Giffen. The contents of the undermost cellar floor is dated to Brindley horizon 1. This dolmen is older then D22, of which the earliest artefacts come from horizon 3.
This small dolmen is inaccessable, since it lies partly hidden in the ground. Fortunately van Giffen has left a detailed excavation plan. Besides that, he made a ground plan of both dolmens together. Therefore the orientation of D22 could be derived well. Subsequently the orientation has been checked in the field via the stones S1, Z1 en Z1'a. D22 appears to have derived its orientation from D21. The proportion grid with which the enclosed right angeled triangle (see the pages D22 and enlarged dolmens is setup, goes over from D21 to D22. In both dolmens the parallel orientation lines have been setup in the grid by the proportion 2:3. For a matter of fact, the grid is more fine-meshed then shown here.
Top left D21 and bottom down D22. 
Beside the orientation lines at 167º, D22 also has lines at 193º. Both mirror each other around south. Those properties it has jointly with D13 near Eext. Here one sees, that both dolmens use the same orientation pattern, but don't resemble each other. This makes it hard to track down patterns and slows down the tempo of research quite a lot. In the figure below the red points reflect the common spots in both building forms. The orientation lines are depending on it partly on it. Notice, that D13 doesn't have any gaps between the side stones, like it's the case in enlarged dolmens.
Midden D22 en rechts D13.