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All of loon's displays access a set of common options. This function sets the font for the title bar of the displays.
l_setTitleFont(size = "16", weight = "bold", family = "Helvetica")
the value of the named option.
the font size.
the font family.
l_getOptionNames, l_userOptions, l_userOptionDefault, l_setOption
l_getOptionNames
l_userOptions
l_userOptionDefault
l_setOption