def set_line_style(color, width=3, line_style='solid'):
    """
    Defines default styling of scatter graphs with some smoothing.
    Args:
        color: line color
        width: line width
        line_style: line style (solid, dashed, ...)

    Returns: line_style dict parameters

    """
    style = dict(color=color, width=width, dash=line_style)
    return style
