,> 40.0mm
 | ,> 50.0mm
 | | ,> 50.0mm
 | | | ,> 40.0mm
+-+-+-+-+
|   |   | 60.0mm
+-+-+-+-+
| |   | | 50.0mm
+ +-+-+ +
| |   | | 50.0mm
+-+-+-+-+
|   |   | 40.0mm
+ + + + +