Hypergrid to determine the best architecture of single zone NNs. The upper panel displays the quality Q of the test and training set for 37 different NNs as explained in Eq. A.1. The number of layers, neurons per layer, and the maximum number of epochs trained for every NN are shown in the lower panels. The lowest panel displays the number of trainable parameters in the NNs. The dashed line denotes the selected NN.