this is how my fitcontributions.xml looks like:
<resources>
<strings>
<string id="fat_label">Fat Burned</string>
<string id="fat_graph_label">Fat Burned</string>
<string id="fat_units">g</string>
<string id="carbs_label">Carbs Burned</string>
<string id="carbs_graph_label">Carbs Burned</string>
<string id="carbs_units">g</string>
</strings>
<fitContributions>
<fitField id="0" displayInChart="true"
sortOrder = "0"
precision="2"
chartTitle="@Strings.fat_label"
dataLabel="@Strings.fat_graph_label"
unitLabel="@Strings.fat_units"
fillColor="#FF0000" />
<fitField id="1" displayInChart="true"
sortOrder = "1"
precision="2"
chartTitle="@Strings.carbs_label"
dataLabel="@Strings.carbs_graph_label"
unitLabel="@Strings.carbs_units"
fillColor="#00FF00" />
</fitContributions>
</resources>
and looks like: