bar3s.m :  dz  undefined at line 56

Dear Mr Jonas
It is just a typo at line 56 into bar3s.m.

![Image](https://github.com/user-attachments/assets/193da712-fd4d-4e86-a575-0af3b51a544c)

![Image](https://github.com/user-attachments/assets/81792cf4-6455-43eb-8a1d-a66cefcfc09f)

![Image](https://github.com/user-attachments/assets/f442b079-402f-42b3-a029-cae3b5f8aaf1)

After that, the results are correct.
best regards
Paulo Ormonde