c# – WPF Scrollview Panning deceleration

So official documentation does not state any “default” values on this topic. I have tried with several values like 0.01, 0.1, 1 and I can’t seem to get the effect where the ScrollView keeps scrolling after an user lifts a finger.

<ScrollViewer Margin="0,210,0,66" x:Name="AboutUsScrollViewer" PanningMode="VerticalOnly" PanningDeceleration="1" PanningRatio="2" VerticalScrollBarVisibility="Hidden" VerticalAlignment="Top">
                    <Image x:Name="AboutUsMainImage" Source="Resourceso nama.png"></Image>

I’m not sure if these are actually device independent units, if so, how do I find the value where I can see the desired effect?

Note: the image is tall enough so there is clearly a lot of room for scrolling, this is not an issue.