boost::optional<dcp::Colour> _effect_colour;
/** scaling factor for line spacing; 1 is "standard", < 1 is closer together, > 1 is further apart */
double _line_spacing;
boost::optional<dcp::Colour> _effect_colour;
/** scaling factor for line spacing; 1 is "standard", < 1 is closer together, > 1 is further apart */
double _line_spacing;