 | (Color online)~The NA49 experiment: beam position detectors BPD, target foil T, time of flight detectors TOF, time projection chambers TPC, and calorimeters CAL. Details can be found in \cite{Afanasev:1999iu}. |
 | (Color online)~Raw yields of particle pairs at 20$A$ and 158$A$ GeV beam energy as a function of ${Y_{\pi\pi}}$ and ${k_{t}}$. |
 | noimgData sets used in this analysis. |
 | (Color online)~Projections of the correlation function on the $q_{out}$ component at 158$A$~GeV beam energy at midrapidity in the transverse momentum bin $0.3<k_{t}<0.4$~GeV/c. Left hand side: requiring a distance of closest approach DCA of 1.6~cm at 10 consecutive padrows, at the right hand side: a DCA of 2.2~cm was required at 70 padrows. |
 | (Color online)~Schematic description of the anti-merging cut: two tracks have to be separated by more than $\Delta s = 2.2$ cm at more than $n_{rows} = 50$ consecutive padrows. |
 | (Color online)~Dependence of the parameter $R_{out}$ on the minimum separation $\Delta s$ and on the required number of rows, at midrapidity at $0.3<k_{t}<0.4$~GeV/c for the 158$A$~GeV beam energy sample. |
 | (Color online)~Schematic description of a split track: a single track (dashed line) is reconstructed as two different tracks (solid lines). |
 | (Color online)~Projections of correlations functions at midrapidity at three different beam energies at low ($0.0<k_{t}<0.1$~GeV/c) and high ($0.4<k_{t}<0.6$~GeV/c) transverse momentum. The projected components have been integrated over 50 MeV/c. The curves show the projections of the fits of Eq.~\ref{eq:finalfitting} to the data. |
 | (Color online)~Fitted radii with (triangles up) and without (triangles down) momentum semearing at midrapidity at 20{\it A} (upper) and 158{\it A} GeV (lower row) respectively. |
 | (Color online)~Rapidity distributions of negative pions and kaons and the antiproton yield at midrapidity at SPS energies. Open symbols indicate reflected values \cite{Afanasiev:2002mx,Gazdzicki:2004ef,Alt:2006dk}. Data at 20{\it A} and 30{\it A} GeV are preliminary results. |
 | (Color online)~$k_{t}$ dependence of fit parameters at midrapidity at 158{\it A} GeV with and without particle identification. |
 | (Color online)~The purity factor $p$ as function of $Y_{\pi\pi}$ and $k_{t}$ derived from simulations at 158{\it A} GeV beam energy. |
 | (Color online)~$k_{t}$ dependence of fit parameters at midrapidity at 158{\it A} GeV assuming different values for the purity factor. |
 | (Color online)~Fit parameters (158$A$ GeV, midrapidity) using various values for the mean pair separation $\langle r^{\ast} \rangle$ in the Coulomb correction procedure. Note the different scales on the the vertical axes. |
 | Dependence of fit parameters on $k_{t}$ at midrapidity at 158{\it A} GeV beam energy. Open symbols indicate measurements by other experiments \cite{Bearden:1998aq,Antinori:2001yi,Rosselet:2002ru,Adamova:2002wi}. |
 | Dependence of fit parameters on $k_{t}$ at midrapidity for different beam energies. Full dots show results from this analysis, open circles indicate measurements of NA45 \cite{Adamova:2002wi}. |
 | Dependence of the fit parameters on rapidity at low $k_{t}$ at different beam energies. Filled symbols correspond to $0.0\!<\!k_{t}\!<0.1\!$~GeV/c, open symbols to ${0.1<k_{t}<0.2}$~GeV/c. |
 | Dependence of the fit parameters on rapidity at high $k_{t}$ at different beam energies. Filled symbols correspond to ${0.2<k_{t}<0.3}$~GeV/c, open symbols to $0.3<k_{t}<0.4$~GeV/c. |
 | (Color online)~Summary of the $k_{t}$ dependence of the radii at various center of mass energies at midrapidity. Data are from AGS \cite{Lisa:2000hw} (squares), this NA49 analysis (circles), PHOBOS \cite{Back:2004ug} (triangles at $\sqrt{s_{NN}}=62$~GeV), and STAR \cite{Adler:2001zd,Adams:2004yc} (triangles at $\sqrt{s_{NN}}=130,200$~GeV). |
 | (Color online)~Dependence of the BE radii, the ratio $R_{out}/R_{side}$ and the volume $V_{f}$ in central PbPb (AuAu) collisions on beam energy at midrapidity. The $k_{t}$-dependence (Fig.~\ref{fig:world_data}) has been interpolated to get numerical values of the radii at $k_{t}=0.2$ GeV/c. |
 | (Color online)~Dependence of the BE radii on $dn/dY$ in central PbPb (AuAu) collisions. Closed symbol correspond to measurements at midrapidity, squares correspond to AGS energies, circles to SPS energies, and triangles to RHIC energies. Open symbols represent NA49 data at forward rapidity $1.0<Y_{\pi\pi}<1.5$. All radii have been interpolated to get values at $k_{t}= 0.2$~GeV/c. |
 | (Color online)~Transverse mass spectra of pions, kaons, and protons in central PbPb collisions at midrapidity measured by NA49. m$_0$ is the particle rest mass. Lines indicate the fit results, numerical values of the fit parameters $T$ and $\rho_{0}$ are also shown. Further details are given in the text. |
 | (Color online)~$k_{t}$-dependence of the radius parameters in central PbPb collisions at midrapidity (data points) compared to fit results (lines). |
 | (Color online)~Energy dependence of the model parameters $T$, $\rho_{0}$, $\tau_0$, $\Delta\tau$, and $R_{geo}$. Input to the fit procedure are the spectra of $\pi^{-}$ and protons, and the radii. Open symbols correspond to a fit of only the spectra, disregarding the radii. Further details and references are given in the text. |