Legend settings (color)
| 1 2 | 
| vl | a Vega-Lite object | 
| orient | the orientation of the legend. One of "left" or "right". This determines how the legend is positioned within the scene. | 
| title | the title for the legend. | 
| format | the formatting pattern for axis labels. This is D3’s number format pattern for quantitative axis and D3’s time format pattern for time axis. | 
| short_time_labels | whether month and day names should be abbreviated. | 
| value | explicitly set the visible legend values. | 
| remove | if  | 
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