call reciprocal axes 'u' and 'v'

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 59.52%. Comparing base (04cede7) to head (d6abb29).

Files	Patch %	Lines
...iFiReaders/readers/microscopy/em/tem/emd_reader.py	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #121 +/- ## ========================================== - Coverage 59.53% 59.52% -0.01% ========================================== Files 47 47 Lines 3719 3721 +2 ========================================== + Hits 2214 2215 +1 - Misses 1505 1506 +1 ``` | [Flag](https://app.codecov.io/gh/pycroscopy/SciFiReaders/pull/121/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pycroscopy) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/pycroscopy/SciFiReaders/pull/121/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pycroscopy) | `59.52% <50.00%> (-0.01%)` | :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=pycroscopy#carryforward-flags-in-the-pull-request-comment) to find out more.

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