OpenOffice: Chart X Axis Format Scale

After doing the experiments, I drew graphs using OpenOffice.

First, I used chart type: Column and Line. Then I couldn't format Chart X Axis (i.e., cannot untick "Automatic" to change the value of Scale Minimum, Maximum, etc.)

Finally, I figured out that I should have used Chart type: XY (Scatter), since in the other Chart types, it considers X Axis value as Text.

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