The next section defines the different layers that the statistics are defined for. The first line contains the word types. Each line after the first contains a single name of a layer that has been defined in the technology file's types section. In this file, however, only the layers that conduct signals in the circuit are typically specified. This section is completed with a line containing the word end. This means that no layer may be called end.
The fab section must include at least every layer that is defined in the routes section of the technology file.