def scatter_df(ax, i, df):
    """
    Scatter plot of df with projections in all 3 axes

    :param plt.subplots ax: Subplot array with minimum dimension [2,3]
    :param int i: Index of row that should be labeled
    :param pd.DataFrame df: Dataframe containing 'x','y','z' columns preferably downsampled for faster plotting
    """
    ax[i, 0].scatter(df.x, df.y, s=10)
    ax[i, 1].scatter(df.x, df.z, s=10)
    ax[i, 2].scatter(df.z, df.y, s=10)
