# Easy question. I use pscoast -JG30/0 -Rg. How do I get only the central meridian, 30East to show on the map?

**URL:** https://forum.generic-mapping-tools.org/t/easy-question-i-use-pscoast-jg30-0-rg-how-do-i-get-only-the-central-meridian-30east-to-show-on-the-map/6036
**Category:** Q&A
**Created:** [July 5, 2025, 2:30pm UTC](https://forum.generic-mapping-tools.org/t/easy-question-i-use-pscoast-jg30-0-rg-how-do-i-get-only-the-central-meridian-30east-to-show-on-the-map/6036 "2025-07-05T14:30:00Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![george](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/george/32/3193_2.png) [@george](https://forum.generic-mapping-tools.org/u/george)
#### Post date: [July 5, 2025, 2:30pm UTC](https://forum.generic-mapping-tools.org/t/easy-question-i-use-pscoast-jg30-0-rg-how-do-i-get-only-the-central-meridian-30east-to-show-on-the-map/6036/1 "2025-07-05T14:30:00Z")

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Easy question. I use pscoast -JG30/0 -Rg. How do I get only the central meridian, 30East to show on the map?

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### Author: ![mkononets](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/mkononets/32/4029_2.png) [@mkononets](https://forum.generic-mapping-tools.org/u/mkononets)
#### Post date: [July 5, 2025, 2:59pm UTC](https://forum.generic-mapping-tools.org/t/easy-question-i-use-pscoast-jg30-0-rg-how-do-i-get-only-the-central-meridian-30east-to-show-on-the-map/6036/2 "2025-07-05T14:59:53Z")

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[Technical Reference / 4. Standardized command line options/ 4.3.8. Custom axes](https://docs.generic-mapping-tools.org/latest/reference/options.html#custom-axes)