def AUlight(exclude=()):
    """Return AU standard colors (light).
    Available colors: 'blue', 'purple', 'cyan', 'turquoise', 'green', 'yellow', 'orange', 'red', 'magenta', and 'gray'.
    
    Keyword arguments:
    exclude -- tuple of strings (default empty)
    """
    AU_colors = {'blue'     :(  0, 61,115),
                 'purple'   :(101, 90,159),
                 'cyan'     :( 55,160,203),
                 'turquoise':(  0,171,164),
                 'green'    :(139,173, 63),
                 'yellow'   :(250,187,  0),
                 'orange'   :(238,127,  0),
                 'red'      :(226,  0, 26),
                 'magenta'  :(226,  0,122),
                 'gray'     :(135,135,135)}
    for ex in exclude:
        AU_colors.pop(ex)
    return AU_colors