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\begin{table*}
\caption[]{48 stars with absolute proper motion for the 
           calibration of the Hipparcos 
           proper motion system. The epoch \\
           of the observations is 1950. The internal
           accuracy of the proper motions is of the order 
           of 2 mas/a.}
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 Designation & HIC number & $\alpha_{2000} $ & $\delta_{2000}$ & $\mu_\alpha$ & $\mu_\delta$  \\
    &    &    [hhmmss.sss]    & [ggmmss.ss]  & [mas/a]    & [mas/a]  \\
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BD +17 1617  &   36921  & 073524.484  & +172259.80  &  $-$11.6  &  $-$11.1  \\
BD +18 1681  &   37009  & 073624.680  & +181055.98  &  $-$16.0  &  $-$25.9  \\
BD +17 1623  &   37074  & 073705.758  & +165415.45  &   $-$1.8  &   $-$6.9  \\
BD +18 1692  &   37160  & 073811.914  & +175028.53  &   +12.9  &   $-$6.2  \\
BD +18 1701  &   37300  & 073928.586  & +174028.33  &    +1.8  &   $-$7.4  \\
BD +17 1634  &   37436  & 074105.828  & +165223.89  &   $-$6.4  &   +8.9  \\
 G 9 $-$ 29  &   43552  & 085210.477  & +200843.80  &  +191.8  & $-$152.3  \\
BD +19 2119  &   43642  & 085320.688  & +191920.42  &  $-$22.9  &  $-$15.6  \\
BD +20 2232  &   43683  & 085355.414  & +195802.05  &  $-$23.2  &  $-$10.6  \\
BD +20 2233  &   43701  & 085400.695  & +201349.63  &  $-$54.1  &   $-$7.9  \\
BD +21 1939  &   43730  & 085421.594  & +203510.55  &  $-$21.9  &   $-$8.4  \\
BD +20 2244  &   43935  & 085657.156  & +201159.97  &   +14.7  &  $-$13.2  \\
BD +20 2683  &   59121  & 120722.977  & +192111.98  &   +13.3  &   $-$2.1  \\
BD +19 2531  &   59152  & 120750.492  & +185659.42  &  +119.7  &  $-$70.3  \\
BD +19 2533  &   59234  & 120855.609  & +181813.91  &  $-$15.1  &  +19.1  \\
BD +19 2534  &   59238  & 120902.383  & +181920.41  & $-$121.7  &  $-$61.2  \\
BD +19 2536  &   59310  & 121005.008  & +185838.25  & $-$159.6  &  $-$37.1  \\
BD +19 2539  &   59391  & 121102.336  & +183731.00  &  $-$40.8  &  $-$20.6  \\
BD +18 2676  &   59418  & 121118.773  & +175844.17  &   +3.1  &  +18.1  \\
BD +19 2541  &   59550  & 121246.570  & +183203.55  &   +86.7  &  $-$26.3  \\
BD +19 2542  &   59571  & 121257.367  & +185828.64  &  $-$19.5  &   +1.6  \\
BD +02 2539  &   60667  & 122600.961  & +020231.02  &  $-$39.1  &   $-$2.8  \\
BD +03 2644  &   60713  & 122633.258  & +022632.56  &    +5.7  &   $-$7.8  \\
BD +01 2701  &   60902  & 122854.531  & +010900.07  &  $-$99.5  & $-$101.0  \\
BD +03 2660  &   61096  & 123117.406  & +021809.05  &  $-$14.1  &   +1.2  \\
BD +29 2486  &   68765  & 140427.594  & +290834.72  &    +7.4  &  $-$32.2  \\
BD +29 2488  &   68793  & 140453.750  & +290221.91  &    +7.5  &   $-$3.9  \\
BD +28 2292  &   68903  & 140625.578  & +274333.78  &  $-$40.3  &  +33.0  \\
BD +29 2491  &   68928  & 140640.359  & +282903.16  &   $-$5.9  &  $-$17.2  \\
BD +29 2493  &   68955  & 140656.094  & +282617.00  &  $-$69.7  &   +4.0  \\
BD +29 2497  &   69024  & 140749.906  & +283243.53  &  +23.1  &   $-$7.8  \\
BD $-$01 3242  &   82040  & 164531.203  &  $-$013441.51  &   $-$9.9  &   $-$3.2  \\
BD $-$01 3243  &   82070  & 164549.250  &  $-$011551.11  &  $-$20.4  &   +8.8  \\
BD $-$01 3244  &   82114  & 164624.438  &  $-$012134.22  &  +40.8  &  $-$76.1  \\
BD $-$02 4247  &   82152  & 164659.734  &  $-$022912.25  &   $-$5.5  &  $-$11.4  \\
BD $-$01 3251  &   82274  & 164840.359  &  $-$015209.98  &   $-$0.1  &   $-$0.3  \\
BD $-$01 3254  &   82382  & 165003.203  &  $-$020205.51  &   $-$8.9  &  $-$12.9  \\
BD +70  973  &   88295  & 180150.172  & +701418.31  &  $-$12.8  &  $-$22.3  \\
BD +69  968  &   89005  & 180955.766  & +694040.13  &  $-$25.1  & +198.5  \\
BD +69  970  &   89113  & 181114.984  & +691456.31  &  +14.7  &  +38.4  \\
BD +69  973  &   89571  & 181641.063  & +694234.88  &  $-$37.8  &   +1.2  \\
BD +79  604  &   92040  & 184537.797  & +795630.50  &  +18.2  &  +71.6  \\
BD +79  605  &   92208  & 184732.391  & +800934.50  &  +18.4  &  +81.1  \\
BD +79  610  &   93162  & 185834.469  & +792320.25  &   +7.7  &  +13.7  \\
BD $-$01 4172  &  106324  & 213205.016  &   $-$004254.76  &  +18.9  &   +6.0  \\
BD $-$01 4173  &  106385  & 213249.516  &   $-$005258.80  &   $-$6.1  &   $-$7.4  \\
BD $-$01 4177  &  106603  & 213525.734  &   $-$005853.37  &   +28.0  &  +21.7  \\
BD $-$01 4178  &  106655  & 213610.766  &  $-$011816.96  &  +22.5  &  $-$30.2  \\
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