Order variations: inversion, rearrangement and duplication. In this prototype visual encoding, each horizontal line represents a portion of a neighborhood around orthologs, in 3 bacterial strains. Orthologs have the same color and label. The inversion illustration shows orthologs in strain 2 with a different orientation, when compared to strains 1 and 3. The rearrangement illustration shows orthologs in strain 2 in a different order, compared to strains 1 and 3. The duplication illustration shows strain 2 with two copies of gene 'B' in strain 2, and two copies of genes 'B' and 'B' in strain 1.