(a) Far-field spectrum of high-order harmonic radiation generated by driving fields ω₁ (2 × 10¹⁴ W/cm², 800 nm) and ω₂ (0.2 × 10¹⁴ W/cm², 400 nm) with 50-μm beam waist, 30-fs pulse length, and at an angle of 8.7 mrad in a slice of neon atoms placed at the focus. Far-field distributions are plotted as a function of delay for (b) 21st order, (c) 25th order, and (d) 29th order taken from panel (a).