Figure 2

Cumulative presentation of the spectral position of the blue reflectance maximum for all four wings of male Polyommatus icarus butterflies. (A) The four sampling sites: TZ: Taizé (Burgundy, Southern France, August 2017); EF: Érd-1 (Central Hungary, May and August 2018); EP: Érd-2 (Central Hungary, May and August 2018); EB: Baraţcoş (Eastern Carpathians, Romania, July 2017). (B) Histograms of the spectral position of the blue reflectance maximum of the same specimens.