\begin{table}%t3
\caption{\label{find}Experimental oscillator strengths (log~$gf$) in \ion{Nb}{ii} sorted by air wavelengths.}
%\centering
\par
\begin{tabular}{llrr}
\hline
\hline
\noalign{\smallskip}
  $\lambda_{\rm air}$    & $\sigma$     & Lower level  & Log($gf$) \\   
  (\AA{})            & (cm$^{-1}$)        & (cm$^{-1}$)        &           \\
\hline                                                                              2242.5800  &     44 577.650    &   1224.823         & $-$1.20 \\    
2263.3106  &     44 169.386    &   801.326          & $-$1.89 \\    
2265.6748  &     44 123.277    &   801.326          & $-$1.37 \\    
2285.2235  &     43 745.889    &   1224.823         & $-$1.14 \\    
2291.3844  &     43 628.304    &   438.361          & $-$2.29 \\    
2300.2897  &     43 459.407    &   158.984          & $-$2.12 \\    
2300.8551  &     43 448.717    &   438.361          & $-$1.96 \\    
2315.1745  &     43 180.030    &   438.361          & $-$1.63 \\    
2320.2400  &     43 085.752    &   801.326          & $-$1.57 \\    
2332.8990  &     42 851.977    &   438.361          & $-$1.93 \\    
2334.8014  &     42 817.065    &   801.326          & $-$1.75 \\    
2343.2745  &     42 662.255    &   1224.823         & $-$1.92 \\    
2372.7316  &     42 132.646    &   0.000            & $-$2.31 \\    
2381.7200  &     41 973.662    &   158.984          & $-$2.22 \\    
2514.3531  &     39 759.692    &   801.326          & $-$1.76 \\    
2541.4244  &     39 336.195    &   1224.823         & $-$1.02 \\    
2566.0734  &     38 958.386    &   9812.452         & $-$1.41 \\    
2590.9428  &     38 584.448    &   10186.390        & +0.17  \\   
2641.0561  &     37 852.364    &   10918.474        & $-$0.86 \\    
2646.253$^{\star}$ &37 778.026 &438.361&$-$0.55  \\
2656.075$^{\star}$  &37 638.332 &158.984&$-$0.61  \\
2666.590$^{\star}$  &37 489.926 &801.326&$-$0.79  \\
2667.1467  &     37 482.100    &   8320.373         & $-$0.59 \\ 
2667.291$^{\star}$  &37 480.076 &0.000&$-$0.77  \\   
2671.6567  &     37 418.838    &   7505.765         & $-$1.30 \\ 
2671.926$^{\star}$  &37 415.061 &801.326&$-$0.33   \\ 
2675.939$^{\star}$  &37 358.955 &438.361&$-$0.73  \\
2678.654$^{\star}$  &37 321.092 &158.984&$-$1.56  \\
2691.770$^{\star}$  &37 139.258 &158.984&$-$0.79  \\
2697.059$^{\star}$  &37 066.429 &1224.823&$+$0.06   \\
2698.858$^{\star}$  &37 041.715 &438.361&$-$0.56   \\
2700.1527  &     37 023.959    &   7900.644         & $-$0.68 \\    
2700.5523  &     37 018.457    &   3542.561         & $-$1.27 \\
2702.194$^{\star}$  &36 995.990 &801.326&$-$0.51  \\
2702.517$^{\star}$  &36 991.564 &1224.823&$-$0.75  \\
2706.397$^{\star}$  &36 938.540 &438.361&$-$1.25  \\
2716.306$^{\star}$  &36 803.790 &158.984&$-$1.18  \\
2716.622$^{\star}$  &36 799.513 &1224.823&$-$0.24  \\
2721.630$^{\star}$  &36 731.805 &0.000&$-$1.42  \\
2721.982$^{\star}$  &36 727.056 &801.326&$-$0.29  \\
2729.5123  &     36 625.754    &   7261.324         & $-$1.77 \\    
2733.256$^{\star}$  &36 575.575 &801.326&$-$0.60  \\
2733.462$^{\star}$  &36 572.821 &158.984&$-$1.05  \\
2734.3521  &     36 560.900    &   7505.765         & $-$1.19 \\    
2737.085$^{\star}$  &36 524.413 &438.361&$-$0.87  \\
2745.3118  &     36 414.981    &   4146.037         & $-$0.86 \\    
2747.3562  &     36 387.869    &   7261.324         & $-$0.94 \\    
2749.6848  &     36 357.067    &   7261.324         & $-$1.32 \\    
2754.5496  &     36 292.869    &   9509.604         & $-$0.74 \\    
2765.9299  &     36 143.428    &   7505.765         & $-$1.45 \\    
2768.124$^{\star}$  &36 114.877 &438.361&$-$0.50  \\
2780.235$^{\star}$  &35 957.568 &4146.037&$-$0.40  \\
2793.041$^{\star}$  &35 792.709 &3542.561&$-$0.71  \\
2793.6766  &     35 784.573    &   7505.765         & $-$1.43 \\    
2798.9044  &     35 717.747    &   7900.644         & $-$1.03 \\    
2810.7918  &     35 566.705    &   8320.373         & $-$0.69 \\    
2827.075$^{\star}$  &35 361.838 &158.984&$-$0.83  \\
2829.750$^{\star}$  &35 328.415 &1224.823&$-$1.55  \\
2841.143$^{\star}$  &35 186.758 &3029.629&$-$0.69  \\
2842.643$^{\star}$  &35 168.184 &2629.132&$-$0.59  \\
2846.279$^{\star}$  &35 123.260 &2356.816&$-$0.73  \\
2861.092$^{\star}$  &34 941.426 &2356.816&$-$0.68  \\
2865.609$^{\star}$  &34 886.354 &0.000&$-$1.18  \\
2866.8425  &     34 871.322    &   7261.324         & $-$2.13 \\    
\hline
2887.0836  &     34 626.881    &   7505.765         & $-$1.52 \\    
2917.0516  &     34 271.176    &   10653.427        & $-$0.66 \\    
2956.8884  &     33 809.499    &   7900.644         & $-$1.29 \\    
2868.521$^{\star}$  &34 850.944 &2629.132&$-$0.37 \\
2875.390$^{\star}$  &34 767.687 &3029.629&$-$0.17  \\
2877.038$^{\star}$  &34 747.769 &2629.132&$-$0.39  \\
2883.174$^{\star}$  &34 673.826 &3542.561&$-$0.04  \\
2888.829$^{\star}$  &34 605.958 &2356.816&$-$0.59  \\
2897.806$^{\star}$  &34 498.753 &3029.629&$-$0.37  \\
2899.233$^{\star}$  &34 481.775 &3542.561&$-$0.34  \\
2908.240$^{\star}$  &34 374.989 &2356.816&$-$0.40 \\
2910.587$^{\star}$  &34 347.272 &3029.629&$-$0.16 \\
2911.742$^{\star}$  &34 333.642 &2629.132&$-$0.28 \\
2927.811$^{\star}$  &34 145.215 &4146.037&$+$0.16 \\
2931.464$^{\star}$  &34 102.673 &2629.132&$-$0.92 \\
2941.543$^{\star}$  &33 985.821 &3542.561&$-$0.05 \\
2946.895$^{\star}$  &33 924.106 &2629.132&$-$1.00 \\
2950.880$^{\star}$  &33 878.299 &4146.037&$+$0.24 \\
2972.5710  &     33 631.122    &   11339.590        & $+$0.32  \\   
2980.7132  &     33 539.252    &   12263.221        & $-$0.29 \\    
2982.102$^{\star}$  &33 523.609 &3029.629&$-$0.85 \\
2991.9493  &     33 413.238    &   10653.427        & $-$0.76 \\    
2994.722$^{\star}$  &33 382.345 &4146.037&$-$0.29 \\
3014.439$^{\star}$  &33 164.006 &2356.816&$-$1.61  \\
3024.7316  &     33 051.241    &   10835.837        & $-$0.18 \\    
3028.441$^{\star}$  &33 010.677 &3542.561&$-$0.20 \\
3029.7413  &     32 996.508    &   12805.965        & $-$0.74 \\    
3029.8088  &     32 995.766    &   10653.427        & $-$1.11 \\    
3032.6351  &     32 964.964    &   10653.427        & $-$1.26 \\    
3039.397$^{\star}$  &32 891.690 &2629.132&$-$1.26 \\
3049.5039  &     32 782.554    &   10835.837        & $-$1.04 \\    
3055.5159  &     32 718.166    &   16052.672        & $-$0.39 \\    
3063.1193  &     32 636.911    &   10653.427        & $-$0.91 \\    
3071.5463  &     32 547.488    &   11339.590        & $-$0.29 \\    
3073.236$^{\star}$  &32 529.538 &2356.816&$-$1.19 \\
3074.270$^{\star}$  &32 518.595 &7261.324&$-$1.69  \\
3076.863$^{\star}$  &32 491.193 &3029.629&$-$0.55 \\
3080.3475  &     32 454.501    &   10835.837        & $-$0.48 \\    
3094.174$^{\star}$  &32 309.420 &4146.037&$+$0.56 \\
3097.1160  &     32 278.801    &   11339.590        & $-$0.84 \\    
3099.181$^{\star}$  &32 257.222 &2629.132&$-$0.93 \\
3100.7738  &     32 240.645    &   8320.373         & $-$1.30 \\    
3110.7976  &     32 136.787    &   13665.686        & $-$1.33 \\    
3113.1748  &     32 112.245    &   13690.228        & $-$1.19 \\    
3128.9145  &     31 950.748    &   11339.590        & $-$1.34 \\    
3129.6522  &     31 943.127    &   10653.427        & $-$0.81 \\    
3130.783$^{\star}$  &31 931.636 &3542.561&$+$0.41 \\
3135.925$^{\star}$  &31 879.275 &7900.644&$-$1.32  \\
3145.402$^{\star}$  &31 783.232 &8320.373&$+$0.12 \\
3163.140$^{\star}$  &31 605.006 &6192.310&$-$1.38  \\
3163.401$^{\star}$  &31 602.404 & 3029.629&$+$0.27 \\
3175.7747  &     31 479.219    &   10653.427        & $-$0.78 \\    
3175.8669  &     31 478.359    &   17292.479        & $+$0.07  \\   
3177.766$^{\star}$  &31 459.546 &8320.374&$-$1.80   \\
3179.2265  &     31 445.143    &   13479.460        & $-$1.53 \\    
3180.285$^{\star}$  &31 434.626 &7900.644&$+$0.10 \\
3181.398$^{\star}$  &31 423.636 &7261.324&$-$1.12 \\
3188.3466  &     31 355.170    &   12263.221        & $-$1.59 \\    
3189.2788  &     31 345.949    &   17424.889        & $-$0.25 \\    
3191.094$^{\star}$  &31 328.160 &4146.037&$-$0.33 \\
3193.4495  &     31 305.026    &   13665.686        & $-$1.77 \\    
3194.2782  &     31 296.809    &   10835.837        & $-$0.77 \\    
3194.974$^{\star}$  &31 290.112 &2629.132&$+$0.12 \\
3206.340$^{\star}$  &31 179.195 &7505.765&$+$0.04 \\
\hline
3207.331$^{\star}$  &31 169.564 &5562.241&$-$1.37   \\
3215.594$^{\star}$  &31 089.472 &8320.374&$-$0.24 \\
3216.187$^{\star}$  &31 083.743 &7900.644&$-$1.52  \\
3222.0580  &     31 027.117    &   12263.221        & $-$0.73 \\    
3223.326$^{\star}$  &31 014.897 &8320.374&$-$0.74 \\
3225.471$^{\star}$  &30 994.274 & 2356.816&$-$0.01 \\
3229.557$^{\star}$  &30 955.063 &7261.324&$-$0.75 \\
3236.400$^{\star}$  &30 889.615 &7900.644&$-$0.30 \\
3237.9954  &     30 874.306    &   10835.837        & $-$0.72 \\    
3242.4077  &     30 832.382    &   13054.696        & $-$1.47 \\    
3244.5078  &     30 812.426    &   12805.965        & $-$1.26 \\    
3247.470$^{\star}$  &30 784.316 &7900.644&$-$0.74 \\
3248.932$^{\star}$  &30 770.464 &6192.310&$-$1.11 \\
3254.062$^{\star}$  &30 721.958 &2629.132&$-$0.50 \\
3267.673$^{\star}$  &30 594.001 &10604.229&$-$1.38   \\
3273.505$^{\star}$  &30 539.495 &6192.310&$-$1.55   \\
3273.880$^{\star}$  &30 535.992 &7261.324&$-$1.68   \\
3277.7583  &     30 499.863    &   13118.528        & $-$1.66 \\    
3291.051$^{\star}$  &30 376.683 &3542.561&$-$1.54 \\
3297.045$^{\star}$  &30 321.461 &3029.629&$-$1.63   \\
3299.5510  &     30 298.404    &   14626.199        & $-$1.16 \\    
3302.616$^{\star}$  &30 270.315 &9509.604&$-$1.49   \\
3303.3216  &     30 263.848    &   14660.755        & $-$0.93 \\    
3304.7036  &     30 251.221    &   15551.252        & $-$0.78 \\    
3319.585$^{\star}$  &30 115.577 &7261.324&$-$0.91 \\
3340.3740  &     29 928.163    &   13690.228        & $-$1.59 \\    
3341.596$^{\star}$  &29 917.215 &10186.390&$-$0.46 \\
3343.892$^{\star}$  &29 896.672 &7900.644&$-$1.31   \\
3343.966$^{\star}$  &29 896.014 &8320.374&$-$0.89 \\
3346.751$^{\star}$  &29 871.136 &7505.765&$-$1.23  \\
3348.7755  &     29 853.103    &   15949.370        & $-$0.90 \\    
3365.587$^{\star}$  &29 703.963 &8320.374&$-$0.74 \\
3365.872$^{\star}$  &29 701.450 &7261.324&$-$1.54   \\
3372.5601  &     29 642.544    &   10918.474        & $-$0.80 \\    
3374.246$^{\star}$  &29 627.738 &7900.644&$-$1.19 \\
3386.238$^{\star}$  &29 522.818 &9812.452&$-$0.46 \\
3388.929$^{\star}$  &29 499.376 &10604.229&$-$1.31  \\
3391.587$^{\star}$  &29 476.257 &7900.644&$-$1.85   \\
3394.9714  &     29 446.922    &   12263.221        & $-$0.80 \\    
3395.7224  &     29 440.466    &   14626.199        & $-$1.28 \\    
3399.7112  &     29 405.910    &   14660.755        & $-$0.63 \\    
3408.673$^{\star}$  &29 328.512 &6192.310&$-$0.58   \\
3409.185$^{\star}$  &29 324.113 &5562.241&$-$0.87  \\
3412.932$^{\star}$  &29 291.914 &7261.324&$-$0.50 \\
3420.625$^{\star}$  &29 226.040 &7505.765&$-$1.12 \\
3421.1646  &     29 221.428    &   11339.590        & $-$1.36 \\    
3425.420$^{\star}$  &29 185.131 &10918.474&$-$0.26 \\
3426.528$^{\star}$  &29 175.690 &10604.229&$-$0.78 \\
3426.568$^{\star}$  &29 175.356 &9509.604&$-$0.50   \\
3436.821$^{\star}$  &29 088.315 &10246.955&$-$1.30  \\
3439.918$^{\star}$  &29 062.130 &7900.644&$-$1.04 \\
3440.581$^{\star}$  &29 056.528 &8320.373&$-$0.69  \\
3448.2179  &     28 992.192    &   14626.199        & $-$1.06 \\    
3448.6696  &     28 988.438    &   14660.755        & $-$1.09 \\    
3450.7619  &     28 970.875    &   14678.318        & $-$0.90 \\    
3452.3409  &     28 957.636    &   14660.755        & $-$0.70 \\    
3478.786$^{\star}$  &28 737.432 &10246.955&$-$0.84  \\
3479.560$^{\star}$  &28 731.041 &10604.229&$-$0.46 \\
3484.046$^{\star}$  &28 694.044 &6192.310&$-$1.06 \\
3489.087$^{\star}$  &28 652.594 &7900.644&$-$1.08 \\
3515.416$^{\star}$  &28 438.005 &10246.955&$-$0.59 \\
3528.4778  &     28 332.703    &   17469.770        & $-$0.66 \\    
3537.622$^{\star}$  &28 259.498 &7261.324&$-$0.96  \\
\hline
3540.959$^{\star}$  &28 232.865 & 8320.373&$-$0.43 \\
3541.2454  &     28 230.683    &   13479.460        & $-$0.85 \\    
3591.194$^{\star}$  &27 837.946 &10186.390&$-$1.31  \\
3619.509$^{\star}$  &27 620.178 &7900.644&$-$0.42 \\
3633.121$^{\star}$  &27 516.698 &12263.221&$-$1.53   \\
3639.0501  &     27 471.891    &   14660.755        & $-$0.98 \\    
3641.3782  &     27 454.328    &   14678.318        & $-$1.56 \\    
3651.182$^{\star}$  &27 380.589 &7505.765&$-$0.48 \\
3688.189$^{\star}$  &27 105.862 &10918.474&$-$1.44 \\
3691.1738  &     27 083.944    &   14626.199        & $-$1.24 \\    
3695.8960  &     27 049.388    &   14660.755        & $-$0.62 \\    
3717.0600  &     26 895.332    &   13665.686        & $+$0.03 \\    
3720.4532  &     26 870.790    &   13690.228        & $-$0.51 \\    
3740.720$^{\star}$  &26 725.223 &13054.696&$-$0.31 \\
3741.288$^{\star}$  &26 721.166 &12263.221&$-$1.39  \\
3781.372$^{\star}$  &26 437.919 &13665.686&$-$0.47 \\
3801.136$^{\star}$  &26 300.459 &13479.460&$-$0.65  \\
3804.012$^{\star}$  &26 280.574 &13054.696&$-$0.98  \\
3818.856$^{\star}$  &26 178.422 &12805.965&$-$0.22 \\
3828.243$^{\star}$  &26 114.233 &13665.686&$-$0.86 \\
3831.844$^{\star}$  &26 089.691 &13690.228&$-$0.25 \\
3855.489$^{\star}$  &25 929.691 &13054.696&$-$1.17   \\
3863.042$^{\star}$  &25 878.995 &12805.965&$-$0.85  \\
3865.004$^{\star}$  &25 865.859 &13118.528&$-$0.83  \\
3879.3421  &     25 770.263    &   14790.755        & $-$0.55 \\    
3898.285$^{\star}$  &25 645.042 &13690.228&$-$0.69 \\
3909.3197  &     25 572.655    &   19351.948        & $-$1.85 \\    
3919.701$^{\star}$  &25 504.927 &13479.460&$-$0.93  \\
3949.445$^{\star}$  &25 312.850 &14790.755&$-$1.06  \\
3952.363$^{\star}$  &25 294.159 &13690.228&$-$0.93 \\
4000.603$^{\star}$  &24 989.164 &14790.755&$-$1.03 \\
4026.3014  &     24 829.673    &   18819.520        & $-$1.53 \\    
4059.674$^{\star}$  &24 625.566 &13665.686&$-$1.18  \\
4061.9711  &     24 611.648    &   15949.370        & $-$1.02 \\    
4073.080$^{\star}$  &24 544.515 &14790.755&$-$1.36  \\
4085.3468  &     24 470.818    &   18819.520        & $-$1.28 \\    
4104.160$^{\star}$  &24 358.650 &13665.686&$-$1.24  \\
4110.309$^{\star}$  &24 322.205 &13054.696&$-$1.61  \\
4114.5320  &     24 297.245    &   19351.948        & $-$1.44 \\    
4126.178$^{\star}$  &24 228.667 &15551.252&$-$1.49  \\
4138.452$^{\star}$  &24 156.809 &12805.965&$-$1.65  \\
4156.671$^{\star}$  &24 050.933 &16052.672&$-$1.12 \\
4185.5335  &     23 885.074    &   21039.529        & $-$1.07 \\    
4216.226$^{\star}$  &23 711.215 &13665.686&$-$1.45  \\
4254.385$^{\star}$  &23 498.542 &13054.696&$-$1.23  \\
4321.481$^{\star}$  &23 133.708 &15551.252&$-$1.20  \\
4367.3789  &     22 890.623    &   18819.520        & $-$1.19 \\    
4367.960$^{\star}$  &22 887.552 &13665.686&$-$1.03 \\
4421.6458  &     22 609.664    &   21039.529        & $-$1.31 \\    
4467.8849  &     22 375.702    &   21511.376        & $-$1.26 \\    
4492.9563  &     22 250.809    &   21039.529        & $-$0.87 \\    
4522.1931  &     22 107.015    &   21511.376        & $-$1.20 \\    
4527.636$^{\star}$  &22 080.389 &12805.965&$-$1.29 \\
4579.444$^{\star}$  &21 830.594 &13690.228&$-$1.02 \\
4588.9970  &     21 785.149    &   20347.497        & $-$1.46 \\    
4699.5812  &     21 272.640    &   20437.503        & $-$1.04 \\    
\hline%\\[-3mm]
%\multicolumn{4}{l}{Note: fot the starred values, see the text.}
\end{tabular}      
\tablefoot{For the starred values, see the text.}                                                    \end{table}