fix #41

[zktuong]

closes #41

[codecov]

Codecov Report

Merging #42 (5592b68) into master (7e63a4c) will decrease coverage by 3.75%.
The diff coverage is 30.00%.

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
- Coverage   76.14%   72.39%   -3.76%     
==========================================
  Files           7        7              
  Lines        1761     1764       +3     
==========================================
- Hits         1341     1277      -64     
- Misses        420      487      +67     

Impacted Files	Coverage Δ
R/plot_cpdb2.R	61.56% <0.00%> (-20.13%)	⬇️
R/plot_cpdb4.R	73.68% <16.66%> (ø)
R/utils.R	86.03% <42.85%> (+0.19%)	⬆️
R/plot_cpdb3.R	79.83% <50.00%> (ø)

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