Table 2: Observational information.

OBJECT		 Filter / Standard Average ${t_{\exp}}$ Number Notese
  Telescopea star countsb   frames  

GL 4029 IRS1		 K / C SAO 12585 / SAO 23728 120 0.20 1536 N!
GL 437-S K / U CMC 302423 / CMC 601567 21 0.13 1200 N
GL 490 J / U CMC 401688 / CMC 302688 31 0.20 1500 -
  H / U SAO 24017 / SAO 23967 116 0.05 4000 N!
  K / U SAO 24017 474 0.02 3500 U
  ${\rm Br}\gamma$/ U SAO 24017 107 0.13 2000 U
  Con / U SAO 24017 70 0.13 2000 U
  H / C SAO 23999c / SAO 24017 120 0.06 1280 N
  K / C SAO 24098 / SAO 24017 537 0.06 1000 U
LkH$\alpha $ 101 J / U SAO 57254 / SAO 57264 73 0.05 3000 C
  H / C SAO 57239 / SAO 57264 692 0.06 1536 C
S235 IRS4 H / U SAO 58357 / SAO 58383 65 0.13 3000 U
  K / C SAO 58343 / SAO 58272 54 0.06 1536 U
S235 IRS1 H / UC SAO 58357 56 0.20 2000 N
  K / U SAO 58343 119 0.05 2000 N
  K / C SAO 58343 / SAO 58272 122 0.20 1536 N
S235 IRS2 K / C SAO 58343 / SAO 58272 190 0.06 1536 U
  H / C SAO 58357 107 0.10 1536 U
NGC 2024 IRS2 Kd / C SAO 132480 853 0.06 1536 U
  H / C SAO 132410 / SAO 132434 144 0.06 1536 U
Mon R2 IRS2 K / U SAO 132881 / SAO 132874 15 0.20 1536 U
Mon R2 IRS3 K / C SAO 133884 / SAO 132874c 106 0.06 1536 N
  H / U SAO 132874 139 0.20 2000 N
  K / U SAO 132884 75 0.02 2000 N
GL 5180 IRS1 K / C SAO 78056c / SAO 77997 23 0.3 768 U
S255 IRS1/3 K / C SAO 95350 41 0.20 1536 N
GL 961-E/W H / U SAO 114047 / SAO 114O94 209 0.25 1000 N!/C
  K / C SAO 114047 / SAO 114O80 62 0.06 1792 U
GL 961-Fan K / U SAO 114047 / SAO 114O94 88 0.13 2000 U
GL 989 H / U SAO 95987 140 0.05 3000 U
  H / C SAO 95987 120 0.06 2048 N!
  K / C SAO 114234 / SAO 114245 68 0.06 1792 U
S106 IR K / C SAO 76077 / SAO 70120 330 0.06 2048 U
  H / C SAO 70120 / SAO 70129 109 0.13 1280 U
GL 2591 H / U SAO 70099 / SAO 49777 29 0.13 2000 -
  K / U SAO 70052 381 0.05 1500 N!
  K / C SAO 70052 / SAO 49730 274 0.06 2048 N!
S140 IRS1 K / C SAO 20051 / SAO 19948 250 0.06 1600 N
NGC 7538 IRS1 K / C SAO 20455 / SAO 20563 21 0.20 1536 N!
a U: UKIRT. C: 3.5 m telescope at Calar Alto.
b Average peak counts per frame.
c These stars were found to be close binaries and so not included in the reduction.
d Object was too bright at K and so a narrow-band filter at 2.26 $\mu$m was used instead.
e Main features observed in the reconstructed images. N: Bright nebula likely to be associated to the outflow cavity. N!: Very low level or hardly resolved nebulosity. C: Close companion (with a separation <1 $.\!\!^{\prime\prime}$5). U: Unresolved source. -: Reconstruction not possible due to the low number of photons per individual frame.

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