TNG/NICS imaging of QSO B0957+561 in subarcsec seeing conditions. Left panels: lens system in the final combined frames with total exposure times of 3.12 ks (J-band), 2.2 ks (H-band), and 4.5 ks (K-band). Middle panels: residual signal after subtracting only the two quasar images (A+B), clearly displaying the main lensing galaxy. Right panels: residual light after subtracting the global photometric model (A+B+GAL). See main text for details.
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