Improve t0 handling

[codecov[bot]]

Codecov Report

Base: 87.50% // Head: 87.26% // Decreases project coverage by -0.23% :warning:

Coverage data is based on head (7e478b9) compared to base (2c4fe2f). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #19 +/- ## ========================================== - Coverage 87.50% 87.26% -0.24% ========================================== Files 7 7 Lines 216 212 -4 ========================================== - Hits 189 185 -4 Misses 27 27 ``` | [Impacted Files](https://codecov.io/gh/mpirke/KM3Acoustics.jl/pull/19?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Markus+Pirke) | Coverage Δ | | |---|---|---| | [src/io.jl](https://codecov.io/gh/mpirke/KM3Acoustics.jl/pull/19/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Markus+Pirke#diff-c3JjL2lvLmps) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Markus+Pirke). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Markus+Pirke)

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