/* Returns SUPER converted to spreadlevel_plot_chart. SUPER must be a spreadlevel_plot_chart, as
reported by is_spreadlevel_plot_chart. */
static inline struct spreadlevel_plot_chart *
/* Returns SUPER converted to spreadlevel_plot_chart. SUPER must be a spreadlevel_plot_chart, as
reported by is_spreadlevel_plot_chart. */
static inline struct spreadlevel_plot_chart *