docs: def get_minmax(self):
          """Return min/max x/z coordinates of grid
  
          Returns
          -------
          x: [float, float]
              min, max values of grid dimensions in x direction (sideways)
          z: [float, float]
              min, max values of grid dimensions in z direction (downwards)
  
          """
          x_minmax = [np.min(self.grid['x']), np.max(self.grid['x'].max())]
          z_minmax = [np.min(self.grid['z']), np.max(self.grid['z'].max())]
          return x_minmax, z_minmax