Fix the value axis in serial chart

Is there some way to set the range of the value axis? My values come from 0 to 18, and i want the graph to be displayed from 0 to 20 always, so I can see all the guides i defined for the values

Hello,

Take a look at strictMinMax attribute of value axis:

<chart:valueAxes>
    <chart:axis strictMinMax="true"
                minimum="0"
                maximum="20"
                .../>
    ...
</chart:valueAxes>