All Figures

$\begin{figure} \par\includegraphics[width=7cm,clip]{7245f01.ps}\end{figure}$ Figure 1: Fraction of recovered members of each substructure for different $r_{{\rm cs}}$ . The solid line connects substructures with $r_{{\rm cs}}$ = 2 and 4.
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In the text

$\begin{figure} \par\includegraphics[width=7.2cm,clip]{7245f02.ps}\end{figure}$ Figure 2: $\chi ^2_{\rm S}$ of simulated noise fluctuations (solid line). Labels are the $r_{{\rm cs}}$ of simulated structures at the abscissa corresponding to their $\chi ^2_{\rm S}$ and at arbitrary ordinates.
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In the text

$\begin{figure} \par\includegraphics[width=7.2cm,clip]{7245f03.ps}\end{figure}$ Figure 3: Small symbols correspond to $\chi ^2_{\rm S}$ as a function of the number of members of noise fluctuations. Crosses, circles, dots and triangles are $\chi ^2_{\rm S}$ for the noise fluctuations of the simulations with $N_{{\rm tot}}$ = 450, 600, 900, and 1200 respectively. Large symbols are $\chi ^2_{\rm S}$ of simulated clusters and subclusters with $r_{{\rm cs}}$ = 1. Horizontal lines mark the levels of $\chi ^2_{{\rm S,threshold}}$ .
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In the text

$\begin{figure} \par\includegraphics[width=7.25cm,clip]{7245f04.ps}\end{figure}$ Figure 4: $\chi ^2_{\rm S}$ distributions for border (thick solid histogram) and central (thick dashed histogram) observed fluctuations. The thin solid line is the normalized distribution of $\chi ^2_{\rm S}$ of the noise fluctuations in our simulations.
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In the text

$\begin{figure} \par\includegraphics[width=6.9cm,clip]{7245f05CMJN.eps}\end{figure}$ Figure 5: Isodensity contours (logarithmically spaced) of the Abell 85 field. The title lists the coordinates of the center. The orientation is East to the left, North to the top. Galaxies belonging to the systems detected by DEDICA are shown as dots of different colors. Black, light green, blue, red, magenta, dark green are for the main system and the subsequent substructures ordered as in Table A.1. Large symbols are for galaxies with $M_V \leq -17.0$ that lie where local densities are higher than the median local density of the structure the galaxy belongs to. Open symbols mark the positions of the first- and second-ranked cluster galaxies, BCG1 and BCG2 respectively. Similar plots for the 55 analysed clusters are available in the electronic version of this journal.
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In the text

$\begin{figure} \par\includegraphics[width=6.5cm,clip]{7245f07.ps}\end{figure}$ Figure 7: Cumulative distributions of the two different indicators ofsubclustering: left panel $N_{\rm sub}$ , right panel $f_{L{\rm sub}}$ .
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In the text

$\begin{figure} \par\includegraphics[width=6.9cm,clip]{7245f08.ps}\end{figure}$ Figure 8: Observed differential distribution of subcluster luminosities (histogram) and theoretical model (arbitrary scaling; De Lucia et al. 2004).
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In the text

$\begin{figure} \par\includegraphics[width=7.25cm,clip]{7245f09.ps}\end{figure}$ Figure 9: Cumulative distributions of distances of BCG1 (solid line) and BCG2 (dashed line) from the density peak of their system.
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In the text

$\begin{figure} \par\includegraphics[width=6.9cm,clip]{7245f10.ps}\end{figure}$ Figure 10: Cumulative distributions of the magnitude difference between BCG1 and BCG2 in clusters with (dashed line) and without subclusters (solid line).
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In the text

$\begin{figure} \par\includegraphics[width=14.5cm,clip]{7245f601.ps}\end{figure}$ Figure 6: Isodensity contours (logarithmically spaced) of the 55 clusters with significant structures. The title lists the coordinates of the center. The orientation is East to the left, North to the top. Galaxies belonging to the systems detected by DEDICA are shown as dots of different colors. Black, light green, blue, red, magenta, dark green are for the main system and the subsequent substructures ordered as in Table A.1. Large symbols are for galaxies with $M_V \leq -17.0$ that lie where local densities are higher than the median local density of the structure the galaxy belongs to. Open symbols mark the positions of the first- and second-ranked cluster galaxies, BCG1 and BCG2 respectively.
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In the text

$\begin{figure}\par\includegraphics[width=14.5cm,clip]{7245f602.ps} \end{figure}$ Figure 6: continued.
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In the text

$\begin{figure}\par\includegraphics[width=14.5cm,clip]{7245f603.ps} \end{figure}$ Figure 6: continued.
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In the text

$\begin{figure}\par\includegraphics[width=14.5cm,clip]{7245f604.ps} \end{figure}$ Figure 6: continued.
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In the text

$\begin{figure}\par\includegraphics[width=14.5cm,clip]{7245f605.ps} \end{figure}$ Figure 6: continued.
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In the text

$\begin{figure}\par\includegraphics[width=14.5cm,clip]{7245f606.ps} \end{figure}$ Figure 6: continued.
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In the text

$\begin{figure}\par\includegraphics[width=14.5cm,clip]{7245f607.ps} \end{figure}$ Figure 6: continued.
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In the text

$\begin{figure}\par\includegraphics[width=14.5cm,clip]{7245f608.ps} \end{figure}$ Figure 6: continued.
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In the text

$\begin{figure}\par\includegraphics[width=14.5cm,clip]{7245f609.ps} \end{figure}$ Figure 6: continued.
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In the text

$\begin{figure}\par\includegraphics[width=6.8cm,clip]{7245f610.ps} \end{figure}$ Figure 6: continued.
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In the text

$\begin{figure} \par\includegraphics[width=7cm,clip]{7245f01.ps}\end{figure}$	Figure 1: Fraction of recovered members of each substructure for different $r_{{\rm cs}}$ . The solid line connects substructures with $r_{{\rm cs}}$ = 2 and 4.
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$\begin{figure} \par\includegraphics[width=7.2cm,clip]{7245f02.ps}\end{figure}$	Figure 2: $\chi ^2_{\rm S}$ of simulated noise fluctuations (solid line). Labels are the $r_{{\rm cs}}$ of simulated structures at the abscissa corresponding to their $\chi ^2_{\rm S}$ and at arbitrary ordinates.
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$\begin{figure} \par\includegraphics[width=7.25cm,clip]{7245f04.ps}\end{figure}$	Figure 4: $\chi ^2_{\rm S}$ distributions for border (thick solid histogram) and central (thick dashed histogram) observed fluctuations. The thin solid line is the normalized distribution of $\chi ^2_{\rm S}$ of the noise fluctuations in our simulations.
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$\begin{figure} \par\includegraphics[width=6.5cm,clip]{7245f07.ps}\end{figure}$	Figure 7: Cumulative distributions of the two different indicators ofsubclustering: left panel $N_{\rm sub}$ , right panel $f_{L{\rm sub}}$ .
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$\begin{figure} \par\includegraphics[width=6.9cm,clip]{7245f08.ps}\end{figure}$	Figure 8: Observed differential distribution of subcluster luminosities (histogram) and theoretical model (arbitrary scaling; De Lucia et al. 2004).
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$\begin{figure} \par\includegraphics[width=7.25cm,clip]{7245f09.ps}\end{figure}$	Figure 9: Cumulative distributions of distances of BCG1 (solid line) and BCG2 (dashed line) from the density peak of their system.
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$\begin{figure} \par\includegraphics[width=6.9cm,clip]{7245f10.ps}\end{figure}$	Figure 10: Cumulative distributions of the magnitude difference between BCG1 and BCG2 in clusters with (dashed line) and without subclusters (solid line).
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$\begin{figure}\par\includegraphics[width=14.5cm,clip]{7245f602.ps} \end{figure}$	Figure 6: continued.
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