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I am plotting a monthly data series and want major ticks every year and minor ticks for quarter values. Using qgraph this works when the time span is greater than 10 years but when I do s=2007 2016 it changes to monthly ticks. Is there a way to maintain the quarterly tick marks with the smaller sample size? If so, what code would you use to program it?

In the graph dialog, select Axes & Scaling->Obs/Date axis. Change the Observations to Label to Custom(Step=Quarter).

The equivalent command would be