I’m trying to make a two color categorical CPT using `makecpt`

, with values at exactly -1 and +1, but can’t seem to get it right. This is with GMT version `6.2.0_92c5676_2020.11.10`

.

```
$ gmt makecpt -Cberlin -T-1/1/2 -F+cNegative,Positive
-1 24.5/12/9.5 B ;Negative
N white
```

```
$ gmt makecpt -Cberlin -T-1/1/1 -F+cNegative,Positive
-1 40.25/104.25/134.5 L ;Negative
0 123.5/50.5/28.5 B ;Positive
N white
```

```
$ gmt makecpt -Cberlin -T-1/1/0.5 -F+cNegative,Positive
-1 81.375/159.12/211.25 L ;Negative
-0.5 20/48.75/62.75 L ;Positive
0 63.75/18/1 L
0.5 188.25/109.25/97.25 B
N white
```

```
$ gmt makecpt -Cberlin -T-1/2/1 -F+cNegative,Positive
-1 61/143/186.5 L ;Negative
0 24.5/12/9.5 L ;Positive
1 167/89.5/73 B
N white
```

### Desired output

How to create a CPT with just two colors (e.g. red and blue) and no centre value (0)?

```
-1 40.25/104.25/134.5 L ;Negative
1 123.5/50.5/28.5 B ;Positive
N white
```