# Grids error

**URL:** https://forum.generic-mapping-tools.org/t/grids-error/3162
**Category:** Q&A
**Created:** [July 28, 2022, 5:10pm UTC](https://forum.generic-mapping-tools.org/t/grids-error/3162 "2022-07-28T17:10:06Z")
**Posts on this page:** 7
**Page:** 1

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### Author: ![Mah.Magdy](https://avatars.discourse-cdn.com/v4/letter/m/f04885/32.png) [@Mah.Magdy](https://forum.generic-mapping-tools.org/u/Mah.Magdy)
#### Post date: [July 28, 2022, 5:10pm UTC](https://forum.generic-mapping-tools.org/t/grids-error/3162/1 "2022-07-28T17:10:06Z")

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![0](https://canada1.discourse-cdn.com/flex047/uploads/gmt/original/2X/8/85ed734ae2238d5ac0937cd3d56b5449b8373e1f.png)  
Hello, why GMT automatically plots grid line every 5 degrees?  
script:  
gmt begin 1 ps  
gmt basemap -JM6i -R30/47/10/34 -Ba2f2g0 -BWESN  
gmt coast -W0.5p -W0.5p -N1/0.5p -G74  
gmt end show  
pause

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<div class="post-metadata">

### Author: ![pwessel](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/pwessel/32/30_2.png) [@pwessel](https://forum.generic-mapping-tools.org/u/pwessel)
#### Post date: [July 28, 2022, 5:42pm UTC](https://forum.generic-mapping-tools.org/t/grids-error/3162/3 "2022-07-28T17:42:10Z")

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I do not see that in my postscript previewer - this is usually a result of the antialias settings of your viewer. There are no such lines in the PostScript file.

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<div class="post-metadata">

### Author: ![Mah.Magdy](https://avatars.discourse-cdn.com/v4/letter/m/f04885/32.png) [@Mah.Magdy](https://forum.generic-mapping-tools.org/u/Mah.Magdy)
#### Post date: [July 29, 2022, 11:41am UTC](https://forum.generic-mapping-tools.org/t/grids-error/3162/4 "2022-07-29T11:41:44Z")

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I tried three outputs (ps, png, and pdf) and all gave these fake grids. Is this error a result of windows settings? I use GSview for ps files.

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### Author: ![pwessel](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/pwessel/32/30_2.png) [@pwessel](https://forum.generic-mapping-tools.org/u/pwessel)
#### Post date: [July 29, 2022, 1:38pm UTC](https://forum.generic-mapping-tools.org/t/grids-error/3162/5 "2022-07-29T13:38:55Z")

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Not sure, this is a recurring thread… In fact (on macOS) my PDF shows the lines because I cannot (easily) control its antialias settings, but gv with PS and making a PNG gives no lines.  
Perhaps @Joaquim has comments on the Windows side settings.

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### Author: ![Joaquim](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/joaquim/32/16_2.png) [@Joaquim](https://forum.generic-mapping-tools.org/u/Joaquim)
#### Post date: [July 29, 2022, 1:56pm UTC](https://forum.generic-mapping-tools.org/t/grids-error/3162/6 "2022-07-29T13:56:02Z")

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I don’t see them. Can this be a GS issue? I keep using a safe and old ghostscript (9.23)

```auto
gmt coast -W0.5p -W0.5p -N1/0.5p -G74 -JM6i -R30/47/10/34 -Ba2f2g0 -BWESN -png lixo

```

 ![lixo](https://canada1.discourse-cdn.com/flex047/uploads/gmt/original/2X/b/bfc07f739622b40db67c1b59fa8bdbf5c5fec7f6.png)

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<div class="post-metadata">

### Author: ![Mah.Magdy](https://avatars.discourse-cdn.com/v4/letter/m/f04885/32.png) [@Mah.Magdy](https://forum.generic-mapping-tools.org/u/Mah.Magdy)
#### Post date: [July 29, 2022, 9:47pm UTC](https://forum.generic-mapping-tools.org/t/grids-error/3162/7 "2022-07-29T21:47:50Z")

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Thank you for your response. I will check my system settings.

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<div class="post-metadata">

### Author: ![Mah.Magdy](https://avatars.discourse-cdn.com/v4/letter/m/f04885/32.png) [@Mah.Magdy](https://forum.generic-mapping-tools.org/u/Mah.Magdy)
#### Post date: [July 29, 2022, 9:48pm UTC](https://forum.generic-mapping-tools.org/t/grids-error/3162/8 "2022-07-29T21:48:48Z")

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Thank you so much for your response.