JHK observation

  No    Ref    J       H       K       J-H     H-K     J-K

 1044     7   9.460   8.910   8.760   0.550   0.150   0.700
 1069     7   6.120   5.270   5.030   0.850   0.240   1.090
 1220     7   7.530   6.330   5.690   1.200   0.640   1.840
 1252     7   8.780   8.150   7.980   0.630   0.170   0.800
 2009     7   8.270   7.630   7.460   0.640   0.170   0.810
 2117     7   6.250   5.400   5.150   0.850   0.250   1.100
 2205     7   8.520   7.840   7.650   0.680   0.190   0.870
 4035     7   7.790   6.850   6.600   0.940   0.250   1.190
 4067     7   8.820   8.190   8.050   0.630   0.140   0.770
 6053     7   8.340   7.700   7.540   0.640   0.160   0.800
 8019     7   9.820   9.290   9.150   0.530   0.140   0.670
 9001     7   5.010   3.870   3.330   1.140   0.540   1.680