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Horizontal and Vertical gridlines on Trend Charts are specified differently depending on whether the chart's orientation is Vertical or Horizontal.

 

The orientation of a chart is specified on the Chart tab:

Horizontal orientation:

X axis is the time - time gridlines are vertical

Y axis is the value - value gridlines are horizontal

Vertical orientation:

X axis is the value - value gridlines are vertical

Y axis is the time - time gridlines are horizontal

 

Value gridlines - are defined from the Pens tab by clicking the Edit button for the selected pen to open the Pen Properties box.

Time gridlines - are specified on the Time Axis & Gridlines tab.