Figure 7: Intensity of (a) harmonic H27 of aligned N2 molecules and (b) H23 of aligned O0 molecules versus delay between the two 800 nm beams. The inset shows the intensity of harmonic H27 from aligned N2 molecules around T≈ 8.4 ps versus delay between the two beams for different relative polarizations of the second beam (circles - parallel; triangles - crossed and squares - 54.70)