GenericMappingTools / GenericMappingTools/gmt

Bug in grdcountour -T+a

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bug
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C
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Description

### BUG:
There is a contour line (that goes trough the Andes) with the tickmark in the opposite direction.

### Doubt:
Should all the contour line have tickmarks?

### Full script:

```
gmt begin grdcontour png
gmt grdmath -Rg -I1 40 21 SDIST = tmp_dist.nc

gmt coast -Rd -JX10/5c -G200 -Sdodgerblue2
gmt grdcontour tmp_dist.nc -C1000 -Wthinnest -T+a -A

gmt coast -Rd -JW40/10c -G200 -Sdodgerblue2 -Y5c
gmt grdcontour tmp_dist.nc -C1000 -Wthinnest -T+a
gmt end show
```
![grdcontour](https://user-images.githubusercontent.com/17908951/144441076-5af1c457-913a-4436-b637-2d426b82ee65.png)

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