Figure 3
(a1–c1) and (a2–c2)The different situations of the interaction of the filaments correspond to two pairs of hotspots during the propagation at three distinct times: the undersides show the CCD images obtained in our experiments and the upsides refer to the relative intensity distributions of the two filaments. (d1) and (d2) The statistical analysis of the filamentation competition: the filamentation competition is divided into three situations A–C corresponding to (a1–c1) and (a2–c2), the dividing lines of three situations are sketched as green dash lines I PF1,3 /I PF2,4  = 1.3 and 2.5 and the probabilities of three situations are noted in corresponding regions.
