\begin{table}%t4 \caption{\label{t-egs_good}The extragalactic sources with reliable $RM$ estimates} %\centering \par \begin{tabular}{lrlr|lrlr|lrlr} \hline \hline\\ $l$ & $b$ & \multicolumn{1}{c}{$RM \pm\Delta RM$} & $I_{\rm H\alpha}$ & $l$ & $b$ & \multicolumn{1}{c}{$RM \pm\Delta RM$} & $I_{\rm H\alpha}$ & $l$ & $b$ & \multicolumn{1}{c}{$RM\pm\Delta RM$} & $I_{\rm H\alpha}$ \\ deg & deg & \multicolumn{1}{c}{rad/m$^2$} & $R$ & deg & deg & \multicolumn{1}{c}{rad/m$^2$} & $R$ & deg & deg & \multicolumn{1}{c}{rad/m$^2$} & $R$ \\ \hline 253.30 & 0.89 & $-$8 $\pm$ 12 & 440 & 274.70 & $-$2.80 & 420 $\pm$ 4 & 27 & 314.50 & 0.30 & $-$738 $\pm$ 19 & 52 \\ 253.52 & 0.83 & $-$50 $\pm$ 26 & 582 & 274.77 & 0.25 & $-$76 $\pm$ 22 & 25 & 314.82 & 0.89 & $-$507 $\pm$ 25 & 38 \\ 254.81 & 0.93 & 84 $\pm$ 13 & 501 & 275.02 & 0.82 & $-$101 $\pm$ 25 & 28 & 317.54 & $-$0.57 & 395 $\pm$ 27 & 24 \\ 254.95 & 0.63 & 8 $\pm$ 32 & 495 & 275.48 & $-$0.68 & 248 $\pm$ 13 & 28 & 319.34 & 1.08 & 241 $\pm$ 21 & 37 \\ 255.16 & 0.24 & $-$35 $\pm$ 16 & 436 & 275.56 & 1.02 & 16 $\pm$ 7 & 23 & 320.83 & 0.88 & $-$8 $\pm$ 20 & 22 \\ 255.27 & 0.16 & 26 $\pm$ 23 & 407 & 275.56 & $-$0.20 & 112 $\pm$ 30 & 31 & 321.48 & 1.02 & $-$243 $\pm$ 8 & 9 \\ 255.36 & $-$0.26 & 97 $\pm$ 10 & 456 & 275.83 & 0.16 & $-$107 $\pm$ 7 & 27 & 321.58 & $-$0.76 & $-$138 $\pm$ 9 & 20 \\ 255.36 & 0.50 & $-$115 $\pm$ 13 & 556 & 275.86 & 0.94 & 0 $\pm$ 21 & 23 & 323.15 & $-$0.52 & 83 $\pm$ 25 & 9 \\ 256.14 & 0.25 & 44 $\pm$ 17 & 484 & 276.46 & 0.89 & $-$17 $\pm$ 20 & 23 & 324.77 & 0.61 & $-$66 $\pm$ 14 & 9 \\ 256.64 & $-$0.22 & 172 $\pm$ 15 & 454 & 277.78 & $-$0.73 & $-$36 $\pm$ 23 & 21 & 325.81 & 1.08 & $-$15 $\pm$ 31 & 8 \\ 257.47 & 0.54 & 23 $\pm$ 20 & 307 & 277.78 & $-$0.81 & $-$77 $\pm$ 3 & 23 & 325.83 & $-$0.30 & 356 $\pm$ 18 & 11 \\ 257.71 & $-$0.66 & 144 $\pm$ 20 & 411 & 279.04 & $-$0.88 & 239 $\pm$ 17 & 32 & 325.93 & 2.92 & $-$159 $\pm$ 28 & 14 \\ 257.92 & 0.65 & 76 $\pm$ 14 & 292 & 279.15 & $-$0.63 & 341 $\pm$ 24 & 31 & 326.30 & 2.17 & $-$357 $\pm$ 10 & 11 \\ 258.52 & 1.02 & 196 $\pm$ 26 & 342 & 279.15 & $-$0.65 & 329 $\pm$ 20 & 30 & 326.54 & 2.18 & $-$505 $\pm$ 14 & 12 \\ 258.77 & 0.08 & 221 $\pm$ 16 & 307 & 279.33 & 0.80 & $-$157 $\pm$ 18 & 28 & 326.69 & $-$1.16 & $-$142 $\pm$ 22 & 20 \\ 259.05 & $-$0.72 & 175 $\pm$ 12 & 295 & 280.62 & $-$0.14 & $-$112 $\pm$ 15 & 25 & 326.80 & 1.57 & $-$768 $\pm$ 8 & 13 \\ 259.05 & $-$0.75 & 150 $\pm$ 12 & 275 & 282.46 & 0.24 & 256 $\pm$ 23 & 30 & 326.94 & 2.40 & $-$808 $\pm$ 29 & 12 \\ 260.69 & $-$0.23 & 204 $\pm$ 12 & 829 & 284.30 & 0.81 & $-$547 $\pm$ 25 & 47 & 327.31 & 0.88 & $-$189 $\pm$ 26 & 14 \\ 263.50 & 0.17 & 260 $\pm$ 28 & 630 & 285.15 & 0.96 & 168 $\pm$ 31 & 55 & 327.52 & 2.70 & $-$595 $\pm$ 16 & 15 \\ 264.24 & 0.88 & 406 $\pm$ 9 & 554 & 295.17 & 0.01 & 363 $\pm$ 22 & 66 & 327.87 & 1.60 & $-$818 $\pm$ 21 & 12 \\ 265.69 & 0.85 & 70 $\pm$ 28 & 449 & 297.67 & 0.77 & 570 $\pm$ 11 & 62 & 328.62 & 1.52 & $-$933 $\pm$ 30 & 12 \\ 266.14 & 1.08 & 211 $\pm$ 29 & 334 & 299.51 & $-$1.10 & 315 $\pm$ 21 & 41 & 328.80 & 2.80 & $-$350 $\pm$ 25 & 11 \\ 266.27 & 0.66 & 396 $\pm$ 18 & 427 & 300.47 & $-$0.99 & 412 $\pm$ 18 & 59 & 329.20 & 2.83 & $-$348 $\pm$ 11 & 12 \\ 267.17 & 0.47 & 323 $\pm$ 28 & 487 & 301.14 & $-$0.09 & 350 $\pm$ 18 & 68 & 330.12 & $-$1.08 & $-$931 $\pm$ 25 & 31 \\ 268.62 & 0.58 & 256 $\pm$ 15 & 632 & 301.70 & 0.25 & 296 $\pm$33 & 75 & 330.35 & 1.81 & 25 $\pm$ 35 & 11 \\ 269.05 & 0.17 & 456 $\pm$ 16 & 1015 & 302.60 & $-$1.17 & 159 $\pm$ 25 & 50 & 330.56 & 1.74 & 4 $\pm$ 11 & 12 \\ 269.55 & 0.45 & 137 $\pm$ 18 & 725 & 303.30 & 0.51 & $-$370 $\pm$ 14 & 45 & 335.32 & 0.60 & $-$138 $\pm$ 11 & 38 \\ 270.56 & $-$0.85 & $-$152 $\pm$ 23 & 666 & 304.53 & 1.00 & 40 $\pm$ 28 & 47 & 337.06 & 0.85 & $-$739 $\pm$ 32 & 59 \\ 270.91 & 0.93 & $-$149 $\pm$ 22 & 521 & 305.62 & $-$1.16 & $-$61 $\pm$ 28 & 114 & 339.65 & $-$0.24 & $-$398 $\pm$ 19 & 40 \\ 271.22 & $-$0.35 & 215 $\pm$ 29 & 512 & 306.87 & 0.02 & $-$197 $\pm$ 27 & 54 & 342.16 & $-$0.74 & 127 $\pm$ 15 & 75 \\ 271.30 & $-$0.06 & 136 $\pm$ 16 & 380 & 306.92 & $-$0.70 & 52 $\pm$ 16 & 105 & 347.40 & $-$1.04 & $-$524 $\pm$ 36 & 49 \\ 271.52 & $-$1.01 & 75 $\pm$ 28 & 602 & 308.64 & $-$0.62 & $-$133 $\pm$ 27 & 54 & 350.52 & $-$0.73 & 277 $\pm$ 32 & 49 \\ 271.70 & $-$0.38 & $-$93 $\pm$ 18 & 600 & 310.20 & $-$1.04 & $-$584 $\pm$ 19 & 52 & 351.31 & $-$0.53 & $-$247 $\pm$ 15 & 54 \\ 272.36 & 0.62 & $-$296 $\pm$ 28 & 506 & 313.96 & $-$0.76 & $-$480 $\pm$ 22 & 68 & 352.13 & 1.15 & 76 $\pm$ 30 & 43 \\ 273.46 & 0.68 & $-$106 $\pm$ 19 & 436 & 313.99 & 0.94 & $-$828 $\pm$ 17 & 64 & 356.57 & 0.87 & 985 $\pm$ 30& 34 \\ 273.57 & 1.28 & 20 $\pm$ 25 & 307 & 314.02 & 1.01 & $-$579 $\pm$ 20 & 54 & & & \multicolumn{1}{c}{} & \\ \hline \end{tabular} %\vspace*{2mm} \end{table}