def METHOD_NAME(x: np.ndarray, data: np.ndarray):
    """
    Helper function of place a single x axis in every other row of a data matrix.
    Args:
        x (np.ndarray): An array of shape (samples,)
        data (np.ndarray): An array of shape (channels, samples)
    Returns:
        np.ndarray: Array of shape (channels*2, samples) where even numbered
            rows are x, odd rows are the data.
    """
    plots = [None] * data.shape[0]
    for i in range(data.shape[0]):
        plots[i] = np.vstack((x, data[i, :]))
    plots = np.vstack(tuple(plots))
    return plots