All Figures

$\begin{figure} \par\includegraphics[width=10cm,clip]{h4678f1.eps} \end{figure}$ Figure 1: Positions of the SOFI slit (I to V) in the HH24-26 region superimposed on the H₂ 2.12 $\mu$ m image by Davis et al. (1997). The adopted PA (measured from north to east) are: 50 $^{\circ }$ (slits I, II); 164 $^{\circ }$ (slit III); 74 $^{\circ }$ (slit IV); 40 $^{\circ }$ (slit V). The outflows' exciting sources HH24MMS, HH25MMS and HH26IR are indicated.
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In the text

$\begin{figure} \par\includegraphics[width=14cm,clip]{fig2.eps} \end{figure}$ Figure 2: Positions of the SOFI slit (I to IV) in the L1660 region (HH72) superimposed on the H₂ 2.12 $\mu$ m image taken at the NTT telescope. The adopted PA are: 84 $^{\circ }$ (slit I); 79 $^{\circ }$ (slit II); 157 $^{\circ }$ (slit III); 117 $^{\circ }$ (slit IV). The candidate jet's exciting source IRAS 07180-2356 is indicated by a cross.
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In the text

$\begin{figure} \par\includegraphics[width=10.2cm,clip]{h4678f3.eps} \end{figure}$ Figure 3: Positions of the SOFI slit (from I to III) in BHR71 superimposed on the H₂ 2.12 $\mu$ m image by Bourke (2001). The adopted PA are: 320 $^{\circ }$ (slit I); 339 $^{\circ }$ (slit II); 177 $^{\circ }$ (slit III). The two driving sources IRS1 and IRS2 (Bourke 2001) are indicated by rectangles. Together with the HH objects 320A/B and 321A/B, we label from 1 to 9 the pure H₂ emission knots identified by Bourke (2001).
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In the text

$\begin{figure} \par\includegraphics[width=13.5cm,clip]{h4678f4.eps} \end{figure}$ Figure 4: Spectrum between 0.95 and 2.5 $\mu$ m of HH26A.
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In the text

$\begin{figure} \par\includegraphics[width=13.5cm,clip]{h4678f5.eps} \end{figure}$ Figure 5: Spectrum between 0.95 and 2.5 $\mu$ m of HH72A.
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In the text

$\begin{figure} \par\includegraphics[width=12.9cm,clip]{h4678f6.eps} \end{figure}$ Figure 6: Spectrum between 0.95 and 2.5 $\mu$ m of HH320A.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{fig7.eps} \end{figure}$ Figure 7: H₂ lines observed with ISAAC in HH72B and HH320A.
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In the text

$\begin{figure} \par\includegraphics[width=7.4cm,clip]{fig8.eps} \end{figure}$ Figure 8: Excitation diagram for HH26 A and B. Lines coming from different vibrational levels are indicated with different symbols: filled circles, open circles, filled triangles, open triangles, filled squares and open squares indicate lines coming from levels from 0 to 5, respectively. The straight line(s) represents the best fit(s) through the data, at the temperature(s) reported in top right angle. The derived value of the extinction is also indicated.
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In the text

$\begin{figure} \par\includegraphics[width=7.9cm,clip]{fig9.eps} \end{figure}$ Figure 9: As in Fig. 8 for the pure H₂ knots in the HH24-26 region. The two crosses in the HH25C panel indicate the positions which would correspond to the 3-1 S(5) and 4-2 S(5) lines by assuming the same ratios with the 1-0 S(1) line as in the HH26C case (see text).
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In the text

$\begin{figure} \par\includegraphics[width=7.4cm,clip]{fig10.eps} \end{figure}$ Figure 10: As in Fig. 8 for HH72 A and B.
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In the text

$\begin{figure} \par\includegraphics[width=7.6cm,clip]{fig11.eps} \end{figure}$ Figure 11: As in Fig. 8 for the pure H₂ knots in the HH72 region.
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In the text

$\begin{figure} \par\includegraphics[width=7.9cm,clip]{fig12.eps} \end{figure}$ Figure 12: As in Fig. 8 for HH 320A/B and HH321A/B.
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In the text

$\begin{figure} \par\includegraphics[width=7.6cm,clip]{fig13.eps} \end{figure}$ Figure 13: As in Fig. 8 for the pure H₂ knots in the BHR71 region.
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In the text

$\begin{figure} \par\includegraphics[width=7cm,clip]{fig14.eps} \end{figure}$ Figure 14: Top panel: [Fe II] 1.644 $\mu$ m/[S II] 1.03 $\mu$ m as function of the temperature, for an electron density of $5 \times 10^4$ cm^-3. The curves refer to different assumptions on the iron abundance. The observed ratio in HH72A is drawn as a hatched area. Bottom panel: as in the top panel for the ratio [Fe II] 1.644 $\mu$ m/[N I] 1.04 $\mu$ m. The parameter g is the ratio between the iron abundance and the fraction of neutral nitrogen.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{fig15.eps} \end{figure}$ Figure 15: Velocity and temperature profiles of the model of HH72A. The velocity is expressed in the shock frame and the preshock gas is to the left. The J-shock discontinuity is evident in both the temperature and velocity profiles.
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In the text

$\begin{figure} \par\includegraphics[width=10cm,clip]{fig16.eps} \end{figure}$ Figure 16: Models predictions for the excitation diagrams of HH72A, HH26A and HH320A. Different symbols distinguish transitions coming from different manifolds.
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In the text

$\begin{figure} \par\includegraphics[width=10.7cm,clip]{fig17.eps} \end{figure}$ Figure 17: Excitation diagram of HH25C: the observational data are compared with predictions from two different steady-state C-shock models (1 and 2) whose parameters are listed in Table 4. The arrows indicate 3 $\sigma$ upper limits on the column densities of the corresponding transitions.
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In the text

$\begin{figure} \par\includegraphics[width=10cm,clip]{h4678f1.eps} \end{figure}$	Figure 1: Positions of the SOFI slit (I to V) in the HH24-26 region superimposed on the H₂ 2.12 $\mu$ m image by Davis et al. (1997). The adopted PA (measured from north to east) are: 50 $^{\circ }$ (slits I, II); 164 $^{\circ }$ (slit III); 74 $^{\circ }$ (slit IV); 40 $^{\circ }$ (slit V). The outflows' exciting sources HH24MMS, HH25MMS and HH26IR are indicated.
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$\begin{figure} \par\includegraphics[width=14cm,clip]{fig2.eps} \end{figure}$	Figure 2: Positions of the SOFI slit (I to IV) in the L1660 region (HH72) superimposed on the H₂ 2.12 $\mu$ m image taken at the NTT telescope. The adopted PA are: 84 $^{\circ }$ (slit I); 79 $^{\circ }$ (slit II); 157 $^{\circ }$ (slit III); 117 $^{\circ }$ (slit IV). The candidate jet's exciting source IRAS 07180-2356 is indicated by a cross.
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$\begin{figure} \par\includegraphics[width=13.5cm,clip]{h4678f4.eps} \end{figure}$	Figure 4: Spectrum between 0.95 and 2.5 $\mu$ m of HH26A.
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$\begin{figure} \par\includegraphics[width=13.5cm,clip]{h4678f5.eps} \end{figure}$	Figure 5: Spectrum between 0.95 and 2.5 $\mu$ m of HH72A.
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$\begin{figure} \par\includegraphics[width=12.9cm,clip]{h4678f6.eps} \end{figure}$	Figure 6: Spectrum between 0.95 and 2.5 $\mu$ m of HH320A.
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$\begin{figure} \par\includegraphics[width=8cm,clip]{fig7.eps} \end{figure}$	Figure 7: H₂ lines observed with ISAAC in HH72B and HH320A.
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$\begin{figure} \par\includegraphics[width=7.9cm,clip]{fig9.eps} \end{figure}$	Figure 9: As in Fig. 8 for the pure H₂ knots in the HH24-26 region. The two crosses in the HH25C panel indicate the positions which would correspond to the 3-1 S(5) and 4-2 S(5) lines by assuming the same ratios with the 1-0 S(1) line as in the HH26C case (see text).
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$\begin{figure} \par\includegraphics[width=7.4cm,clip]{fig10.eps} \end{figure}$	Figure 10: As in Fig. 8 for HH72 A and B.
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$\begin{figure} \par\includegraphics[width=7.6cm,clip]{fig11.eps} \end{figure}$	Figure 11: As in Fig. 8 for the pure H₂ knots in the HH72 region.
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$\begin{figure} \par\includegraphics[width=7.9cm,clip]{fig12.eps} \end{figure}$	Figure 12: As in Fig. 8 for HH 320A/B and HH321A/B.
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$\begin{figure} \par\includegraphics[width=7.6cm,clip]{fig13.eps} \end{figure}$	Figure 13: As in Fig. 8 for the pure H₂ knots in the BHR71 region.
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{fig15.eps} \end{figure}$	Figure 15: Velocity and temperature profiles of the model of HH72A. The velocity is expressed in the shock frame and the preshock gas is to the left. The J-shock discontinuity is evident in both the temperature and velocity profiles.
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$\begin{figure} \par\includegraphics[width=10cm,clip]{fig16.eps} \end{figure}$	Figure 16: Models predictions for the excitation diagrams of HH72A, HH26A and HH320A. Different symbols distinguish transitions coming from different manifolds.
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$\begin{figure} \par\includegraphics[width=10.7cm,clip]{fig17.eps} \end{figure}$	Figure 17: Excitation diagram of HH25C: the observational data are compared with predictions from two different steady-state C-shock models (1 and 2) whose parameters are listed in Table 4. The arrows indicate 3 $\sigma$ upper limits on the column densities of the corresponding transitions.
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