/* clear stripchart span - both x & y spans */
clearspan(win)
{
        if (argc < 1) win = refwin(w0);

        if (clearspan_defined(win))
        {
                clearspanx(win);
                clearspany(win);
        }
}


clearspan_defined(win)
{
        local status;

        status =  getspany(win, 0) != getspany(win, 1);
        status |= getspanx(win, 0) != getspanx(win, 1);
        
        return(status);
}