fix uneven columns and rows

[zktuong]

I think this fixes #51

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (a6d8460) 97.29% compared to head (3607c50) 97.03%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #63 +/- ## ========================================== - Coverage 97.29% 97.03% -0.27% ========================================== Files 7 7 Lines 666 674 +8 ========================================== + Hits 648 654 +6 - Misses 18 20 +2 ``` | [Flag](https://app.codecov.io/gh/zktuong/ktplotspy/pull/63/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zewen+Kelvin+Tuong) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/zktuong/ktplotspy/pull/63/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zewen+Kelvin+Tuong) | `97.03% <88.23%> (-0.27%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zewen+Kelvin+Tuong#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files](https://app.codecov.io/gh/zktuong/ktplotspy/pull/63?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zewen+Kelvin+Tuong) | Coverage Δ | | |---|---|---| | [ktplotspy/plot/plot\_cpdb\_chord.py](https://app.codecov.io/gh/zktuong/ktplotspy/pull/63?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zewen+Kelvin+Tuong#diff-a3RwbG90c3B5L3Bsb3QvcGxvdF9jcGRiX2Nob3JkLnB5) | `100.00% <100.00%> (ø)` | | | [ktplotspy/utils/settings.py](https://app.codecov.io/gh/zktuong/ktplotspy/pull/63?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zewen+Kelvin+Tuong#diff-a3RwbG90c3B5L3V0aWxzL3NldHRpbmdzLnB5) | `100.00% <100.00%> (ø)` | | | [ktplotspy/plot/plot\_cpdb.py](https://app.codecov.io/gh/zktuong/ktplotspy/pull/63?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zewen+Kelvin+Tuong#diff-a3RwbG90c3B5L3Bsb3QvcGxvdF9jcGRiLnB5) | `93.46% <83.33%> (-0.65%)` | :arrow_down: |

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