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Table 4

Error budget on reff.

System reff (′′) σ rand σ sky σ xs σ ys σ Is σ xg σ yg σ arc Total error
MG0414+0534 0.660 0.044 0.010 0.029 0.029 0.028 0.017 0.073 N.A. 0.100
HE0435-1223 0.872 0.008 0.001 0.026 0.027 0.034 0.030 0.034 0.034 0.076
RXJ0911+0551 0.869 0.106 0.018 0.105 0.102 0.063 0.077 0.007 N.A. 0.207
SDSS0924+0219 0.253 0.012 0.031 0.009 0.009 0.009 0.007 0.025 0.043 0.062
PG1115+080 0.443 0.012 0.041 0.032 0.032 0.032 0.017 0.047 0.033 0.092
SDSS1138+0314 0.199 0.005 0.000 0.002 0.002 0.005 0.008 0.039 0.075 0.085
B1422+231 0.107 0.012 0.014 0.030 0.026 0.027 0.015 0.014 N.A. 0.056

Notes. From left to right: dispersion, sky subtraction, positions and intensities of the sources, position of the galactic centre, and subtraction of the arc. N.A. stands for “not applicable”.

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