# Question on Vega "Zoomable Scatter Plot Example" **URL:** \ **Category:** Kibana\ **Tags:** vega\ **Created:** [October 18, 2021, 9:30pm UTC](https://discuss.elastic.co/t/question-on-vega-zoomable-scatter-plot-example/287033 "2021-10-18T21:30:34Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![nsimi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nsimi/32/39013_2.png) [@nsimi](https://discuss.elastic.co/u/nsimi)\ **Post date:** [October 18, 2021, 9:30pm UTC](https://discuss.elastic.co/t/question-on-vega-zoomable-scatter-plot-example/287033/1 "2021-10-18T21:30:35Z")
Hello All, I was looking at [this](https://vega.github.io/vega/examples/zoomable-scatter-plot/) example to try to understand how to make my visualization zoomable and panable and in doing that when I try to work with the example in my instance it complains about "xext" and I can't see where that is defined anywhere on the spec, is this built into vega? and if so why would it complain about it for me? I assume I am making a simple mistake but would appreciate some help here. Thank you! ---
**Author:** ![nsimi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nsimi/32/39013_2.png) [@nsimi](https://discuss.elastic.co/u/nsimi)\ **Post date:** [October 19, 2021, 9:10pm UTC](https://discuss.elastic.co/t/question-on-vega-zoomable-scatter-plot-example/287033/2 "2021-10-19T21:10:15Z")
I found it with experimentation that the "xext" and the "yext" are coming from the transform of type "extent" in the data set. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [November 16, 2021, 9:10pm UTC](https://discuss.elastic.co/t/question-on-vega-zoomable-scatter-plot-example/287033/3 "2021-11-16T21:10:57Z")
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