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Table 1:

Positions and extent in galactic coordinates of the star forming regions (SFR) employed.
    l1a l2 b1 b2 d  
Name Object b [deg] [deg] [deg] [deg] [pc] References
Sgr R1 RN 7 14 -2 1 1560 van den Bergh (1966)
Vul R1 RN 53 57 0 4 440 van den Bergh (1966)
Cyg OB4 NOBA 81 85 -9 -6 1000 de Zeeuw et al. (1999)
Cyg OB7 NOBA 84 96 -5 9 740 de Zeeuw et al. (1999)
Lac OB1 NOBA 94 107 -19 -7 368 de Zeeuw et al. (1999)
Cep OB2 NOBA 96 108 -1 12 615 de Zeeuw et al. (1999)
Cep OB6 NOBA 100 110 -2 2 270 de Zeeuw et al. (1999)
Cep R2 RN 103 112 10 15 700 van den Bergh (1966)
Cep R1 RN 105 109 3 7 700 van den Bergh (1966)
Cep OB3 NOBA 108 113 1 7 960 de Zeeuw et al. (1999)
Cep OB4 NOBA 116 120 3 7 845 de Zeeuw et al. (1999)
Cam OB1 NOBA 130 153 -3 8 900 de Zeeuw et al. (1999)
$\alpha $Persei NOBA 140 155 -11 -3 177 de Zeeuw et al. (1999)
Per OB2 NOBA 156 164 -22 -13 318 de Zeeuw et al. (1999)
Per R1 RN 156 161 -22 -17 400 van den Bergh (1966)
Tau R1 RN 166 167 -24 -23 125 van den Bergh (1966)
Tau R2 RN 173 175 -17 -13 125 van den Bergh (1966)
Ori OB1 NOBA 197 215 -26 -12 500 de Zeeuw et al. (1999)
Mon OB1 NOBA 201 205 -3 3 715 de Zeeuw et al. (1999)
Mon R1 RN 201 204 -1 3 715 van den Bergh (1966)
Ori R1 RN 204 207 -18 -13 500 van den Bergh (1966)
Ori R2 RN 208 213 -21 -18 500 van den Bergh (1966)
Cma R1 RN 222 226 -4 -2 1315 van den Bergh (1966)
Col 121 NOBA 222 244 -15 -3 592 de Zeeuw et al. (1999)
Vela OB2 NOBA 255 270 -15 -2 410 de Zeeuw et al. (1999)
Trumpler 10 NOBA 255 270 -2 4 366 de Zeeuw et al. (1999)
Sco OB2 -5 NOBA 273 292 -20 5 145 de Zeeuw et al. (1999)
Low.Cen.Crux NOBA 285 312 -10 21 118 de Zeeuw et al. (1999)
Sco OB2-4 NOBA 292 313 -10 16 145 de Zeeuw et al. (1999)
Up.Cen.Lup NOBA 310 345 0 25 140 de Zeeuw et al. (1999)
Sco OB2-3 NOBA 313 337 5 31 145 de Zeeuw et al. (1999)
Sco OB2-1 NOBA 330 3 -19 7 145 de Zeeuw et al. (1999)
Sco OB2-2 NOBA 337 3 7 32 145 de Zeeuw et al. (1999)
Sco R1 RN 346 2 13 23 160 van den Bergh (1966)

Notes. (a) The SFR is assumed to be a rectangle in the sky. The galactic coordinates l1, l2, b1, and b2 define such rectangle; (b) RN means reflection nebulae and NOBA means nearby OB association.


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