All Figures

$\begin{figure} \par\includegraphics[width=4cm,clip]{6839fg01.ps}\includegraphics[width=4cm,clip]{6839fg02.ps} \end{figure}$ Figure 1: Left: combination of the 4 calibrated images from the F160W filter data set obtained with the HST/NICMOS-2, the grey scale going from 0% (black) to 3.2% (white) of the maximum intensity; Right: combination of the 8 calibrated images from the F180M filter data set obtained with the HST/NICMOS-2, the grey scale going from 0% (black) to 4.7% (white) of the maximum intensity. The structure of the PSF is obvious. North is to the top and East to the left.
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In the text

$\begin{figure} \par\includegraphics[width=4cm,clip]{6839fg03.ps}\includegraphics[width=4cm,clip]{6839fg04.ps} \end{figure}$ Figure 2: PSF constructed by the Tiny Tim software for one of the frames in each set. We can easily see the spikes and the complex structure of the NIC-2 PSFs whatever the filter. Left: F160W, the grey scale goes from 0% (black) to 0.13% (white) of the peak intensity; Right: F180M, the grey scale goes from 0% (black) to 0.16% (white) of the peak intensity.
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In the text

$\begin{figure} \par\includegraphics[width=4cm,clip]{6839fg05.ps}\includegraphics[width=4cm,clip]{6839fg06.ps} \end{figure}$ Figure 3: Results of the simultaneous deconvolution for the F160W data set using a deconvolved Tiny Tim PSF. Left: deconvolved image, the grey scale going from 0% (black) to 0.45% (white) of the maximum intensity. Right: residuals (see text) of the deconvolution. The remnant structure around each point sources is obvious.
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In the text

$\begin{figure} \par\includegraphics[width=4.2cm,clip]{6839fg07.ps}\includegraphi... ...m,clip]{6839fg09.ps}\includegraphics[width=4.2cm,clip]{6839fg10.ps} \end{figure}$ Figure 4: Corrections applied to the PSFs at different stages of the process for one of the images of the F160W data set. The grey scale goes from -2.6% (black) to +2.6% (white) of the peak intensity of the deconvolved Tiny Tim PSF. Top left: corrections to the PSF in the first iteration (starting from the deconvolved Tiny Tim PSF). Top right: corrections at the second iteration. Bottom left: corrections at the fourth iteration. Bottom right: corrections at the last iteration.
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In the text

$\begin{figure} \par\includegraphics[width=4.2cm,clip]{6839fg11.ps}\includegraphics[width=4.2cm,clip]{6839fg12.ps} \end{figure}$ Figure 5: Corrections applied to the PSFs at different stages of the process for one of the images of the F180M data set. The grey scale goes from -4.8% (black) to +4.8% (white) of the peak intensity of the deconvolved Tiny Tim PSF. Left: corrections to the PSF in the first iteration (starting from the deconvolved Tiny Tim PSF). Right: corrections at the last iteration.
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In the text

$\begin{figure} \par\includegraphics[width=4.2cm,clip]{6839fg13.ps}\includegraphi... ...m,clip]{6839fg15.ps}\includegraphics[width=4.2cm,clip]{6839fg16.ps} \end{figure}$ Figure 6: Final results of the simultaneous deconvolution for the F160W data set. North is to the top and East to the left. Top left: smooth background common to all images of the set where the lensing galaxy is encircled. Top right: deconvolved image (point sources plus smooth background); the point sources are labelled as in Magain et al. (1988). Bottom left: mean residual map of the simultaneous deconvolution. Bottom right: image reconvolved to the instrument resolution, with the point sources removed.
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In the text

$\begin{figure} \par\includegraphics[width=4.2cm,clip]{6839fg17.ps}\includegraphi... ...m,clip]{6839fg19.ps}\includegraphics[width=4.2cm,clip]{6839fg20.ps} \end{figure}$ Figure 7: Final results of the simultaneous deconvolution for the F180M data set. North is to the top and East to the left. Top left: smooth background common to all images of the set where the lensing galaxy is encircled. Top right: deconvolved image (point sources plus smooth background); the point sources are labelled as in Magain et al. (1988). Bottom left: mean residual map of the simultaneous deconvolution. Bottom right: image reconvolved to the instrument resolution, with the point sources removed.
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In the text

$\begin{figure} \par\includegraphics[width=5.7cm,clip]{6839fg21.ps} \end{figure}$ Figure 8: Synthetic image of a gravitationally-lensed quasar with a configuration similar to the Cloverleaf: 4 point sources, a faint lensing object, and a partial Einstein ring. The orientation is the same as the original F160W Cloverleaf images.
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In the text

$\begin{figure} \par\includegraphics[width=5.8cm,clip]{6839fg22.ps} \end{figure}$ Figure 9: Synthetic image convolved with a HST-type PSF unknown to the test performer and with added random noise similar to the actual observation.
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In the text

$\begin{figure} \par\includegraphics[width=4.5cm,clip]{6839fg23.ps}\par\includegr... ...ip]{6839fg24.ps}\par\includegraphics[width=4.5cm,clip]{6839fg25.ps} \end{figure}$ Figure 10: Results of the last iteration on the synthetic image. Top: diffuse background. Middle: diffuse background plus point sources. Bottom: residual map of the deconvolution.
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In the text

$\begin{figure} \par\includegraphics[width=4cm,clip]{6839fg03.ps}\includegraphics[width=4cm,clip]{6839fg04.ps} \end{figure}$	Figure 2: PSF constructed by the Tiny Tim software for one of the frames in each set. We can easily see the spikes and the complex structure of the NIC-2 PSFs whatever the filter. Left: F160W, the grey scale goes from 0% (black) to 0.13% (white) of the peak intensity; Right: F180M, the grey scale goes from 0% (black) to 0.16% (white) of the peak intensity.
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$\begin{figure} \par\includegraphics[width=4cm,clip]{6839fg05.ps}\includegraphics[width=4cm,clip]{6839fg06.ps} \end{figure}$	Figure 3: Results of the simultaneous deconvolution for the F160W data set using a deconvolved Tiny Tim PSF. Left: deconvolved image, the grey scale going from 0% (black) to 0.45% (white) of the maximum intensity. Right: residuals (see text) of the deconvolution. The remnant structure around each point sources is obvious.
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$\begin{figure} \par\includegraphics[width=4.2cm,clip]{6839fg11.ps}\includegraphics[width=4.2cm,clip]{6839fg12.ps} \end{figure}$	Figure 5: Corrections applied to the PSFs at different stages of the process for one of the images of the F180M data set. The grey scale goes from -4.8% (black) to +4.8% (white) of the peak intensity of the deconvolved Tiny Tim PSF. Left: corrections to the PSF in the first iteration (starting from the deconvolved Tiny Tim PSF). Right: corrections at the last iteration.
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$\begin{figure} \par\includegraphics[width=5.7cm,clip]{6839fg21.ps} \end{figure}$	Figure 8: Synthetic image of a gravitationally-lensed quasar with a configuration similar to the Cloverleaf: 4 point sources, a faint lensing object, and a partial Einstein ring. The orientation is the same as the original F160W Cloverleaf images.
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$\begin{figure} \par\includegraphics[width=5.8cm,clip]{6839fg22.ps} \end{figure}$	Figure 9: Synthetic image convolved with a HST-type PSF unknown to the test performer and with added random noise similar to the actual observation.
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$\begin{figure} \par\includegraphics[width=4.5cm,clip]{6839fg23.ps}\par\includegr... ...ip]{6839fg24.ps}\par\includegraphics[width=4.5cm,clip]{6839fg25.ps} \end{figure}$	Figure 10: Results of the last iteration on the synthetic image. Top: diffuse background. Middle: diffuse background plus point sources. Bottom: residual map of the deconvolution.
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