def get_fig_size(ratio=None, scale=None):
    """Get size of figure given a ratio and a scale.

    Parameters
    ----------
    ratio: float
        Something like 16:9 or 4:3
    scale: float
        A multiplicative factor to ccale the original figure keeping its ratio"""
    ratio = 4 / 3.0 if ratio is None else ratio
    scale = 1.0 if scale is None else scale
    height = 5
    width = height * ratio
    return (width * scale, height * scale)