The items in each of the lists can be a literal value, like 5 or
"blue", or they can be a scaled_value object.
| 1 2 | 
| title | A named list of text properties for the legend title. | 
| labels | A named list of text properties for legend labels. | 
| symbols | A named list of line properties for symbols (for discrete legend items). | 
| gradient | A named list of line properties a continuous color gradient. | 
| legend | A named list of line properties for the overall legend. The x and y position can be set here, which will override automatic positioning. | 
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