Scatter
A numeric x makes the x-axis a LINEAR scale (not band). <points> is a scatter layer; fill="score" colours each point by a color scale.
Result
Source examples/scatter.svgn
<diagram padding="26">
<!-- A numeric x makes the x-axis a LINEAR scale (not band). <points> is a
scatter layer; `fill="score"` colours each point by a color scale. -->
<data name="scores">
<record hours="1" score="52"/>
<record hours="2" score="61"/>
<record hours="3" score="58"/>
<record hours="4" score="72"/>
<record hours="5" score="79"/>
<record hours="6" score="85"/>
<record hours="8" score="92"/>
</data>
<plot data="scores" width="360" height="260">
<points x="hours" y="score" fill="score" r="6"/>
</plot>
</diagram>