**Table 2:** MIDI squared visibilities of Achernar. The position angle is counted positively East of North ( $N=0^\circ$ , $E=90^\circ$ ).
Baseline	UT1-UT4	UT1-UT4	UT1-UT2	UT1-UT2	UT3-UT4
Proj. B (m)	129.39	130.22	52.38	49.58	62.46
Pos. Angle ( $^\circ$ )	48.89	32.23	4.94	29.69	126.54
$\lambda$ ( $\mu$ m)	$V^2(\lambda) \pm \sigma$	$V^2(\lambda) \pm \sigma$	$V^2(\lambda) \pm \sigma$	$V^2(\lambda) \pm \sigma$	$V^2(\lambda) \pm \sigma$
7.623	$0.770 \pm 0.022$	$0.711 \pm 0.031$	$0.947 \pm 0.079$	$0.879 \pm 0.041$	$0.938 \pm 0.042$
7.695	$0.771 \pm 0.022$	$0.693 \pm 0.028$	$0.946 \pm 0.079$	$0.890 \pm 0.042$	$0.959 \pm 0.042$
7.767	$0.760 \pm 0.028$	$0.703 \pm 0.031$	$0.948 \pm 0.081$	$0.847 \pm 0.037$	$0.991 \pm 0.052$
7.839	$0.791 \pm 0.032$	$0.732 \pm 0.030$	$0.936 \pm 0.079$	$0.867 \pm 0.036$	$0.992 \pm 0.051$
7.911	$0.786 \pm 0.023$	$0.694 \pm 0.026$	$0.925 \pm 0.082$	$0.873 \pm 0.039$	$1.043 \pm 0.072$
7.982	$0.793 \pm 0.028$	$0.708 \pm 0.026$	$0.921 \pm 0.077$	$0.875 \pm 0.038$	$1.005 \pm 0.065$
8.053	$0.812 \pm 0.029$	$0.726 \pm 0.025$	$0.908 \pm 0.078$	$0.888 \pm 0.038$	$1.011 \pm 0.062$
8.123	$0.802 \pm 0.028$	$0.725 \pm 0.024$	$0.906 \pm 0.076$	$0.894 \pm 0.039$	$0.999 \pm 0.058$
8.194	$0.810 \pm 0.024$	$0.729 \pm 0.025$	$0.901 \pm 0.076$	$0.875 \pm 0.037$	$0.988 \pm 0.046$
8.263	$0.809 \pm 0.025$	$0.737 \pm 0.025$	$0.901 \pm 0.077$	$0.881 \pm 0.037$	$0.971 \pm 0.045$
8.333	$0.812 \pm 0.024$	$0.754 \pm 0.025$	$0.901 \pm 0.077$	$0.870 \pm 0.036$	$0.969 \pm 0.045$
8.402	$0.807 \pm 0.026$	$0.751 \pm 0.023$	$0.899 \pm 0.077$	$0.878 \pm 0.034$	$0.971 \pm 0.044$
8.471	$0.809 \pm 0.026$	$0.752 \pm 0.024$	$0.884 \pm 0.077$	$0.876 \pm 0.036$	$0.966 \pm 0.040$
8.539	$0.817 \pm 0.024$	$0.760 \pm 0.024$	$0.902 \pm 0.077$	$0.877 \pm 0.036$	$0.979 \pm 0.044$
8.607	$0.825 \pm 0.023$	$0.754 \pm 0.023$	$0.894 \pm 0.076$	$0.885 \pm 0.038$	$0.986 \pm 0.042$
8.674	$0.824 \pm 0.024$	$0.750 \pm 0.023$	$0.899 \pm 0.076$	$0.887 \pm 0.036$	$1.003 \pm 0.047$
8.741	$0.829 \pm 0.021$	$0.756 \pm 0.024$	$0.896 \pm 0.077$	$0.886 \pm 0.035$	$0.997 \pm 0.047$
8.807	$0.830 \pm 0.021$	$0.754 \pm 0.028$	$0.898 \pm 0.079$	$0.883 \pm 0.038$	$0.996 \pm 0.054$
8.874	$0.825 \pm 0.026$	$0.758 \pm 0.027$	$0.910 \pm 0.080$	$0.879 \pm 0.035$	$0.991 \pm 0.057$
8.939	$0.818 \pm 0.025$	$0.752 \pm 0.028$	$0.899 \pm 0.080$	$0.863 \pm 0.034$	$0.980 \pm 0.058$
9.004	$0.836 \pm 0.030$	$0.761 \pm 0.027$	$0.907 \pm 0.080$	$0.877 \pm 0.037$	$0.968 \pm 0.055$
9.069	$0.824 \pm 0.028$	$0.772 \pm 0.028$	$0.917 \pm 0.080$	$0.878 \pm 0.039$	$0.972 \pm 0.058$
9.133	$0.837 \pm 0.027$	$0.775 \pm 0.029$	$0.896 \pm 0.080$	$0.878 \pm 0.036$	$0.959 \pm 0.052$
9.197	$0.840 \pm 0.025$	$0.790 \pm 0.032$	$0.901 \pm 0.082$	$0.876 \pm 0.038$	$0.938 \pm 0.055$
9.260	$0.846 \pm 0.026$	$0.778 \pm 0.030$	$0.905 \pm 0.083$	$0.872 \pm 0.039$	$0.970 \pm 0.060$
9.322	$0.867 \pm 0.030$	$0.816 \pm 0.035$	$0.910 \pm 0.082$	$0.880 \pm 0.038$	$0.934 \pm 0.054$
9.385	$0.869 \pm 0.032$	$0.800 \pm 0.041$	$0.922 \pm 0.083$	$0.886 \pm 0.037$	$0.928 \pm 0.051$
9.446	$0.867 \pm 0.031$	$0.780 \pm 0.040$	$0.924 \pm 0.081$	$0.897 \pm 0.034$	$0.940 \pm 0.060$
9.507	$0.822 \pm 0.040$	$0.801 \pm 0.049$	$0.950 \pm 0.089$	$0.883 \pm 0.038$	$0.927 \pm 0.082$
9.568	$0.816 \pm 0.040$	$0.798 \pm 0.049$	$0.921 \pm 0.090$	$0.915 \pm 0.049$	$0.882 \pm 0.098$
9.628	$0.823 \pm 0.044$	$0.744 \pm 0.059$	$0.921 \pm 0.102$	$0.919 \pm 0.054$	$0.938 \pm 0.100$
9.688	$0.841 \pm 0.042$	$0.756 \pm 0.055$	$0.950 \pm 0.096$	$0.944 \pm 0.046$	$0.932 \pm 0.096$
9.747	$0.821 \pm 0.051$	$0.788 \pm 0.056$	$0.905 \pm 0.101$	$0.947 \pm 0.062$	$0.899 \pm 0.116$
9.806	$0.840 \pm 0.047$	$0.775 \pm 0.060$	$0.913 \pm 0.104$	$0.979 \pm 0.059$	$0.911 \pm 0.125$
9.864	$0.819 \pm 0.044$	$0.770 \pm 0.045$	$0.934 \pm 0.097$	$0.923 \pm 0.056$	$0.935 \pm 0.099$
9.922	$0.838 \pm 0.036$	$0.780 \pm 0.051$	$0.965 \pm 0.091$	$0.908 \pm 0.049$	$0.960 \pm 0.092$
9.980	$0.834 \pm 0.051$	$0.777 \pm 0.045$	$0.952 \pm 0.088$	$0.920 \pm 0.044$	$0.940 \pm 0.106$
10.037	$0.866 \pm 0.041$	$0.782 \pm 0.038$	$0.926 \pm 0.091$	$0.923 \pm 0.044$	$0.940 \pm 0.103$
10.093	$0.836 \pm 0.032$	$0.799 \pm 0.045$	$0.904 \pm 0.089$	$0.910 \pm 0.046$	$0.961 \pm 0.083$
10.149	$0.834 \pm 0.035$	$0.816 \pm 0.042$	$0.893 \pm 0.084$	$0.894 \pm 0.043$	$0.946 \pm 0.086$
10.205	$0.875 \pm 0.036$	$0.795 \pm 0.039$	$0.900 \pm 0.085$	$0.883 \pm 0.045$	$0.931 \pm 0.083$
10.260	$0.871 \pm 0.040$	$0.802 \pm 0.033$	$0.917 \pm 0.089$	$0.900 \pm 0.049$	$0.938 \pm 0.075$
10.315	$0.873 \pm 0.033$	$0.804 \pm 0.048$	$0.903 \pm 0.087$	$0.917 \pm 0.044$	$0.936 \pm 0.075$
10.369	$0.862 \pm 0.037$	$0.800 \pm 0.046$	$0.909 \pm 0.089$	$0.888 \pm 0.044$	$0.897 \pm 0.088$
10.423	$0.860 \pm 0.035$	$0.810 \pm 0.049$	$0.897 \pm 0.088$	$0.920 \pm 0.045$	$0.918 \pm 0.074$
10.477	$0.883 \pm 0.035$	$0.840 \pm 0.050$	$0.880 \pm 0.084$	$0.923 \pm 0.049$	$0.908 \pm 0.077$
10.530	$0.870 \pm 0.029$	$0.818 \pm 0.048$	$0.913 \pm 0.096$	$0.918 \pm 0.042$	$0.890 \pm 0.076$
10.582	$0.868 \pm 0.038$	$0.810 \pm 0.049$	$0.935 \pm 0.091$	$0.927 \pm 0.044$	$0.869 \pm 0.077$
10.635	$0.853 \pm 0.035$	$0.843 \pm 0.051$	$0.928 \pm 0.091$	$0.907 \pm 0.047$	$0.869 \pm 0.071$
10.687	$0.854 \pm 0.028$	$0.838 \pm 0.059$	$0.938 \pm 0.093$	$0.908 \pm 0.050$	$0.845 \pm 0.079$
10.739	$0.847 \pm 0.051$	$0.836 \pm 0.045$	$0.952 \pm 0.094$	$0.886 \pm 0.050$	$0.877 \pm 0.082$
10.790	$0.872 \pm 0.040$	$0.827 \pm 0.044$	$0.948 \pm 0.095$	$0.934 \pm 0.052$	$0.868 \pm 0.079$
10.841	$0.865 \pm 0.051$	$0.857 \pm 0.046$	$0.907 \pm 0.088$	$0.934 \pm 0.050$	$0.850 \pm 0.084$
10.892	$0.870 \pm 0.038$	$0.843 \pm 0.045$	$0.920 \pm 0.082$	$0.959 \pm 0.055$	$0.845 \pm 0.097$
10.942	$0.862 \pm 0.029$	$0.839 \pm 0.052$	$0.913 \pm 0.104$	$0.944 \pm 0.055$	$0.838 \pm 0.079$
10.993	$0.903 \pm 0.040$	$0.797 \pm 0.058$	$0.921 \pm 0.096$	$0.926 \pm 0.049$	$0.858 \pm 0.089$
11.042	$0.870 \pm 0.035$	$0.825 \pm 0.046$	$0.965 \pm 0.095$	$0.967 \pm 0.054$	$0.871 \pm 0.099$
11.092	$0.876 \pm 0.042$	$0.805 \pm 0.057$	$0.980 \pm 0.104$	$0.928 \pm 0.047$	$0.870 \pm 0.098$
11.141	$0.849 \pm 0.033$	$0.851 \pm 0.048$	$0.959 \pm 0.099$	$0.928 \pm 0.051$	$0.858 \pm 0.093$
11.190	$0.854 \pm 0.034$	$0.855 \pm 0.053$	$0.930 \pm 0.094$	$0.931 \pm 0.058$	$0.859 \pm 0.096$
11.239	$0.931 \pm 0.042$	$0.845 \pm 0.055$	$0.967 \pm 0.096$	$0.936 \pm 0.061$	$0.869 \pm 0.104$
11.288	$0.912 \pm 0.048$	$0.793 \pm 0.066$	$0.954 \pm 0.094$	$0.964 \pm 0.064$	$0.891 \pm 0.110$
11.336	$0.892 \pm 0.044$	$0.827 \pm 0.055$	$0.955 \pm 0.098$	$0.993 \pm 0.054$	$0.891 \pm 0.106$
11.384	$0.885 \pm 0.042$	$0.843 \pm 0.062$	$0.982 \pm 0.097$	$0.960 \pm 0.060$	$0.853 \pm 0.108$
11.432	$0.842 \pm 0.040$	$0.826 \pm 0.060$	$0.927 \pm 0.099$	$0.934 \pm 0.067$	$0.924 \pm 0.112$
11.480	$0.885 \pm 0.056$	$0.875 \pm 0.055$	$0.959 \pm 0.093$	$0.960 \pm 0.062$	$0.869 \pm 0.118$
11.528	$0.882 \pm 0.036$	$0.863 \pm 0.065$	$0.991 \pm 0.109$	$0.955 \pm 0.064$	$0.895 \pm 0.103$
11.575	$0.880 \pm 0.047$	$0.889 \pm 0.058$	$0.962 \pm 0.095$	$0.985 \pm 0.066$	$0.872 \pm 0.118$
11.622	$0.858 \pm 0.038$	$0.907 \pm 0.068$	$0.936 \pm 0.097$	$0.925 \pm 0.058$	$0.888 \pm 0.116$
11.669	$0.863 \pm 0.049$	$0.876 \pm 0.049$	$0.948 \pm 0.109$	$0.916 \pm 0.071$	$0.868 \pm 0.108$
11.716	$0.870 \pm 0.050$	$0.863 \pm 0.060$	$1.004 \pm 0.110$	$0.897 \pm 0.058$	$0.926 \pm 0.112$
11.763	$0.851 \pm 0.059$	$0.876 \pm 0.070$	$1.078 \pm 0.107$	$0.956 \pm 0.067$	$0.893 \pm 0.134$
11.809	$0.877 \pm 0.041$	$0.893 \pm 0.073$	$0.966 \pm 0.105$	$0.967 \pm 0.062$	$0.910 \pm 0.122$
11.856	$0.867 \pm 0.060$	$0.901 \pm 0.074$	$0.951 \pm 0.091$	$1.003 \pm 0.081$	$0.894 \pm 0.111$
11.902	$0.851 \pm 0.051$	$0.907 \pm 0.062$	$0.987 \pm 0.109$	$0.965 \pm 0.077$	$0.890 \pm 0.145$
11.948	$0.894 \pm 0.044$	$0.885 \pm 0.079$	$1.012 \pm 0.097$	$0.986 \pm 0.085$	$0.936 \pm 0.143$
11.994	$0.851 \pm 0.057$	$0.922 \pm 0.051$	$1.018 \pm 0.092$	$0.929 \pm 0.078$	$0.896 \pm 0.126$
12.039	$0.871 \pm 0.057$	$0.890 \pm 0.072$	$0.947 \pm 0.094$	$0.938 \pm 0.062$	$0.934 \pm 0.121$
12.085	$0.838 \pm 0.043$	$0.886 \pm 0.047$	$1.047 \pm 0.111$	$0.941 \pm 0.068$	$0.869 \pm 0.112$
12.130	$0.810 \pm 0.043$	$0.925 \pm 0.059$	$0.993 \pm 0.094$	$0.896 \pm 0.092$	$0.896 \pm 0.113$
12.175	$0.901 \pm 0.070$	$0.860 \pm 0.065$	$1.003 \pm 0.105$	$0.961 \pm 0.069$	$0.892 \pm 0.147$
12.220	$0.823 \pm 0.067$	$0.845 \pm 0.060$	$0.988 \pm 0.096$	$0.992 \pm 0.080$	$0.898 \pm 0.125$
12.265	$0.903 \pm 0.059$	$0.928 \pm 0.071$	$0.957 \pm 0.102$	$1.038 \pm 0.069$	$0.866 \pm 0.125$
12.310	$0.919 \pm 0.060$	$0.862 \pm 0.065$	$0.973 \pm 0.123$	$1.007 \pm 0.066$	$0.858 \pm 0.112$
12.355	$0.844 \pm 0.068$	$0.872 \pm 0.077$	$0.972 \pm 0.115$	$1.061 \pm 0.100$	$1.048 \pm 0.155$
12.399	$0.907 \pm 0.082$	$0.967 \pm 0.073$	$1.035 \pm 0.094$	$1.092 \pm 0.111$	$0.895 \pm 0.110$
12.443	$0.877 \pm 0.072$	$0.878 \pm 0.069$	$1.061 \pm 0.140$	$0.942 \pm 0.071$	$0.886 \pm 0.109$
12.487	$0.865 \pm 0.082$	$0.989 \pm 0.083$	$1.021 \pm 0.098$	$0.942 \pm 0.074$	$0.818 \pm 0.123$
12.530	$0.827 \pm 0.057$	$0.879 \pm 0.078$	$1.008 \pm 0.100$	$0.890 \pm 0.079$	$0.842 \pm 0.117$
12.574	$0.886 \pm 0.058$	$0.943 \pm 0.076$	$1.009 \pm 0.102$	$1.004 \pm 0.078$	$0.855 \pm 0.138$
12.617	$0.877 \pm 0.094$	$0.938 \pm 0.091$	$1.043 \pm 0.131$	$0.873 \pm 0.091$	$0.887 \pm 0.171$
12.660	$0.816 \pm 0.129$	$0.858 \pm 0.088$	$1.042 \pm 0.113$	$1.044 \pm 0.120$	$0.863 \pm 0.178$
12.702	$0.871 \pm 0.109$	$0.965 \pm 0.092$	$1.013 \pm 0.116$	$0.996 \pm 0.102$	$0.828 \pm 0.192$
12.745	$0.841 \pm 0.088$	$0.815 \pm 0.077$	$0.987 \pm 0.121$	$1.146 \pm 0.127$	$0.825 \pm 0.155$
12.787	$0.777 \pm 0.111$	$0.855 \pm 0.075$	$0.969 \pm 0.146$	$1.052 \pm 0.164$	$0.804 \pm 0.164$
12.828	$0.893 \pm 0.141$	$0.803 \pm 0.111$	$1.075 \pm 0.113$	$1.049 \pm 0.146$	$0.872 \pm 0.182$
12.869	$0.739 \pm 0.120$	$0.848 \pm 0.085$	$1.078 \pm 0.130$	$0.988 \pm 0.109$	$0.818 \pm 0.187$
12.910	$0.905 \pm 0.099$	$0.917 \pm 0.100$	$0.940 \pm 0.124$	$0.979 \pm 0.102$	$0.818 \pm 0.266$
12.950	$0.806 \pm 0.117$	$0.923 \pm 0.083$	$1.157 \pm 0.151$	$0.988 \pm 0.163$	$0.775 \pm 0.184$
12.990	$0.655 \pm 0.213$	$0.892 \pm 0.130$	$0.944 \pm 0.123$	$0.926 \pm 0.168$	$0.799 \pm 0.195$
13.030	$0.783 \pm 0.175$	$0.813 \pm 0.087$	$0.808 \pm 0.150$	$0.851 \pm 0.140$	$0.823 \pm 0.209$

Source LaTeX | All tables | In the text