code: @Override
      public void removeChemModel(int pos) {
          for (int i = pos; i < chemModelCount - 1; i++) {
              chemModels[i] = chemModels[i + 1];
          }
          chemModels[chemModelCount - 1] = null;
          chemModelCount--;
      }
docs: Remove a ChemModel from this ChemSequence.
  
  @param  pos  The position of the ChemModel to be removed.