LMTR: fix radius encoding

[MaxenceGollier]

closes #246

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 84.64%. Comparing base (e0f214d) to head (a664e03).
⚠️ Report is 246 commits behind head on master.

Files with missing lines	Patch %	Lines
src/LMTR_alg.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #247       +/-   ##
===========================================
+ Coverage   61.53%   84.64%   +23.11%     
===========================================
  Files          11       13        +2     
  Lines        1292     1622      +330     
===========================================
+ Hits          795     1373      +578     
+ Misses        497      249      -248     

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