Transverse PV maps across the Th 28 jets, sampled from the MUSE data at knot positions and at ±1.4″ from the source position (close to the jet base). The maps are binned across 1″ sections along the jet axis and colour bars are as in Fig. 5. Rows a and b show the [S II]λλ 6716/6731 and [Fe II]λλ 7155/8617 ratios, both primarily sensitive to electron density n_e. The remaining rows are as follows: c, [N II]λ(6548+6583)/5755 tracing electron temperature T_e; d, [S II]λ(6716+6731)/[O I]λ(6300+6363) tracing T_e and the ionisation fraction x_e; e, [N II]λ(6548+6583)/[S II]λ(6716+6731) tracing x_e, n_e and T_e and f, [N II]λ(6548+6583)/[O I]λ(6300+6363) tracing x_e and T_e.