def METHOD_NAME(self,corners=None):
    """
    Plot the grid mesh. Does not automatically show the figure.
    """
    import matplotlib.pyplot as plt
    plt.figure()
    plt.scatter(self.x, self.y, marker='x', color='blue', label='nodes')
    x, y = getattr(self.boundary, 'context').exterior.xy
    plt.plot(x, y, color='green', label='boundary')
    plt.legend()
    plt.title('Unstructured grid: %s\n%s' % (self.name, self.proj))
    plt.xlabel('lon [deg E]')
    plt.ylabel('lat [deg N]')
    if corners is not None:
        plt.xlim(corners[0],corners[1])
        plt.ylim(corners[2],corners[3])