\begin{table}%ta.9 online
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\par
\caption{\label{pox4lineas}Dereddened line intensity ratios with respect to $I$(\Hb)=100 for regions analyzed in POX~4, UM 420, and SBS 0926+606.}
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Line  & $f(\lambda)$&  POX 4 & POX 4 Comp &     UM 420 & SBS 0926+606A &    SBS 0926+606B        \\
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 3679.36   H	I &  0.265 &  0.30  $\pm$  0.07   &	\nodata          &	  \nodata &	   \nodata &	    \nodata\\
 3682.81   H	I &  0.264 &  0.40  $\pm$  0.08   &	\nodata          &	  \nodata &	   \nodata &	    \nodata\\
 3686.83   H	I &  0.263 &  0.74  $\pm$  0.10   &        \nodata   &	  \nodata &	   \nodata &	    \nodata\\
 3691.56   H	I &  0.263 &  0.92  $\pm$  0.11   &        \nodata   &	  \nodata &	   \nodata &	    \nodata\\
 3697.15   H	I &  0.262 &  1.08  $\pm$  0.12   &        \nodata   &	 0.53:    &	   \nodata &	    \nodata\\
 3703.86   H	I &  0.260 &  2.02  $\pm$  0.17   &        \nodata   &  0.93   $\pm$   0.36 &	   \nodata &	    \nodata\\
 3711.97   H	I &  0.259 &  1.86  $\pm$  0.16   &        \nodata   &  1.14   $\pm$   0.38 &	   \nodata &	    \nodata\\
 3721.83  [S III] &  0.257 &  3.68  $\pm$  0.24   &        \nodata   &  1.30   $\pm$   0.39 &	   \nodata &	    \nodata\\
 3726.03  [O  II] &  0.257 &  42.8  $\pm$  2.0    &   142  $\pm$  35     &  85.9   $\pm$   4.7  &	   \nodata &	    \nodata\\
 3728.82  [O  II] &  0.256 &  57.1  $\pm$  2.7    &   165  $\pm$  40     & 140.2   $\pm$   7.5  &	   \nodata &	    \nodata\\
 3734.17   H	I &  0.255 &  2.58  $\pm$  0.19   &        \nodata   &  2.19  $\pm$  0.45 &	   \nodata &	    \nodata\\
 3750.15   H	I &  0.253 &  2.88  $\pm$  0.21   &        \nodata   &  2.32  $\pm$  0.46 &	   \nodata &	    \nodata\\
 3770.63   H	I &  0.249 &  3.77  $\pm$  0.25   &        \nodata   &  2.41  $\pm$  0.47 &	   \nodata &	    \nodata\\
 3797.90   H	I &  0.244 &  5.30  $\pm$  0.37   &        \nodata   &  3.36  $\pm$  0.75 &	   \nodata &	    \nodata\\
 3819.61  He	I &  0.240 &  0.91  $\pm$  0.11   &        \nodata   &	 0.87:    &	   \nodata &	    \nodata\\
 3835.39   H	I &  0.237 &  7.18  $\pm$  0.40   &        \nodata   &  5.96  $\pm$  0.70 &	   \nodata &	    \nodata\\
 3868.75 [Ne III] &  0.230 &  51.7  $\pm$  2.3    &      35.6:       &  29.7  $\pm$  2.0  &	   \nodata &	    \nodata\\
 3889.05   H	I &  0.226 & 17.75  $\pm$  0.95   &        \nodata   &  16.8  $\pm$  1.5  &	   \nodata &	    \nodata\\
 3967.46 [Ne III] &  0.210 & 16.17  $\pm$  0.78   &        \nodata   &  6.45  $\pm$  0.72 &	   \nodata &	    \nodata\\
 3970.07   H	I &  0.210 & 15.36  $\pm$  0.71   &        \nodata   &  16.1  $\pm$  1.2  &	   \nodata &	    \nodata\\
 4009.22  He	I &  0.202 &  0.15  $\pm$  0.06   &	\nodata          &	  \nodata &	   \nodata &	    \nodata\\
 4026.21  He	I &  0.198 &  1.57  $\pm$  0.14   &        \nodata   &  1.55  $\pm$  0.40 &	   \nodata &	    \nodata\\
 4068.60  [S  II] &  0.189 &  0.92  $\pm$  0.11   &        \nodata   &  2.40  $\pm$  0.46 &	   \nodata &	    \nodata\\
 4076.35  [S  II] &  0.187 &  0.28  $\pm$  0.07   &	\nodata          &	 0.71:    &	   \nodata &	    \nodata\\
 4101.74   H	I &  0.182 &  26.0  $\pm$  1.2    &      \nodata	 &  26.1  $\pm$  2.1  &	   \nodata &	    \nodata\\
 4143.76  He	I &  0.172 &	   0.13:      &	    \nodata      &	  \nodata &	   \nodata &	    \nodata\\
 4168.97  He	I &  0.167 &	    \nodata   &        \nodata   &       \nodata  &  0.77  $\pm$  0.25 &	   \nodata\\
 4276.83 [Fe  II] &  0.142 &	   0.08:      &	    \nodata      &	  \nodata &	   \nodata &	    \nodata\\
 4287.40 [Fe  II] &  0.139 &	   0.11:      &	    \nodata      &	 0.42:    &	   \nodata &	    \nodata\\
 4340.47   H	I &  0.127 &  51.2  $\pm$  2.3    &    49  $\pm$  16     &  47.0  $\pm$  3.0  &	 47.5  $\pm$  2.8 &  47.4  $\pm$  9.1\\
 4363.21  [O III] &  0.121 & 11.89  $\pm$  0.61   &        \nodata   &  4.48  $\pm$  0.82 &  7.00  $\pm$  0.66 &	    \nodata\\
 4387.93  He	I &  0.115 &  0.42  $\pm$  0.08   &	\nodata          &	 0.21:    &	   \nodata &	    \nodata\\
 4413.78 [Fe III] &  0.109 &	   0.07:      &	    \nodata      &	  \nodata &	   \nodata &	    \nodata\\
 4471.48  He	I &  0.095 &  4.12  $\pm$  0.26   &        \nodata   &  3.07  $\pm$  0.50 &  3.69  $\pm$  0.41 &	    \nodata\\
 4562.60  Mg   I] &  0.073 &  0.19  $\pm$  0.06   &	\nodata          &	  \nodata &	     0.44: &	    \nodata\\
 4571.20  Mg   I] &  0.071 &	   0.13:      &	    \nodata      &	  \nodata &	   \nodata &	    \nodata\\
 4658.10 [Fe III] &  0.050 &  0.64  $\pm$  0.09   &	\nodata          &  1.31  $\pm$  0.46 & 1.20  $\pm$  0.40 &	    \nodata\\
 4686.00  He   II &  0.043 &  1.21  $\pm$  0.16   &        \nodata   &  1.04  $\pm$  0.28 &  0.72  $\pm$  0.21 &	    \nodata\\
 4701.53 [Fe III] &  0.039 &	   0.14:      &	    \nodata      &	  \nodata &	   \nodata &	    \nodata\\
 4711.37 [Ar  IV] &  0.037 &  1.86  $\pm$  0.15   &        \nodata   &	  \nodata &	     0.49: &	    \nodata\\
 4713.14  He	I &  0.037 &	    \nodata   &        \nodata   &	 0.45:    &  0.72  $\pm$  0.24 &	    \nodata\\
 4740.16 [Ar  IV] &  0.030 &  1.34  $\pm$  0.12   &        \nodata   &   \nodata      &	    0.49: &	   \nodata\\
 4754.83 [Fe III] &  0.026 &	    \nodata   &        \nodata   &    \nodata     &	    0.29: &	   \nodata\\
% 4769.60 [Fe III] &  0.023 &	   0.07:      &	    \nodata      &  \nodata       &	  \nodata &	   \nodata\\
 4861.33   H	I &  0.000 & 100.0  $\pm$  4.3    &   100  $\pm$  19     & 100.0  $\pm$  5.5  &	100.0  $\pm$  4.9 &   100  $\pm$  14\\
 4881.00 [Fe III] & --0.005 &  0.15  $\pm$  0.06   &	\nodata          &	  \nodata &	     0.29: &	    \nodata\\
 4921.93  He	I & --0.015 &  0.49  $\pm$  0.10   &        \nodata   &	 0.22:    &  0.38: &	    \nodata\\
 4958.91  [O III] & --0.024 &   237  $\pm$  10     &	 93  $\pm$  19       & 106.8  $\pm$  6.0  &	 157.8  $\pm$  7.7 &   134  $\pm$  18\\
 4985.90 [Fe III] & --0.031 &  0.57  $\pm$  0.09   &	\nodata          &	 0.57:    &	   \nodata &	    \nodata\\
 5006.84  [O III] & --0.036 &   731  $\pm$  32     &	255  $\pm$  55       &   312  $\pm$  17   &	   \nodata &	    \nodata\\
 5015.68  He	I & --0.038 &  2.57  $\pm$  0.21   &        \nodata   &	  \nodata &	    \nodata &	     \nodata\\
 5041.03  Si   II & --0.044 &	   0.14:      &	    \nodata      &	  \nodata &	    \nodata &	     \nodata\\
 5047.74  He	I & --0.046 &  0.16  $\pm$  0.06   &	\nodata          &	  \nodata &	    \nodata &	     \nodata\\
 5197.90  [N   I] & --0.082 &  0.23  $\pm$  0.06   &	\nodata          &	  \nodata &	    \nodata &	     \nodata\\
 5200.26  [N   I] & --0.083 &  0.30  $\pm$  0.07   &	\nodata          &	  \nodata &	    \nodata &	     \nodata\\
 5270.40 [Fe III] & --0.100 &        \nodata   &        \nodata   &       0.48:    &          \nodata&        \nodata\\
 5517.71 [Cl III] & --0.154 &  0.31  $\pm$  0.07   &	\nodata          &	 0.25:    &	   \nodata &	    \nodata\\
 5537.88 [Cl III] & --0.158 &  0.23  $\pm$  0.08   &	\nodata          &	 0.26:    &	   \nodata &	    \nodata\\
 5754.64  [N  II] & --0.194 &	   0.08:      &	    \nodata      &	 0.59:    &	   \nodata &	    \nodata\\
 5875.64  He	I & --0.215 & 10.93  $\pm$  0.56   &        \nodata   & 10.51  $\pm$  0.79 & 10.77  $\pm$  0.85 &  12.4  $\pm$  4.0\\
 6300.30  [O   I] & --0.282 &  1.81  $\pm$  0.12   &        \nodata   &  7.49  $\pm$  0.49 &  3.13  $\pm$  0.30 &	   5.32:\\
 6312.10  [S III] & --0.283 &  1.60  $\pm$  0.12   &        \nodata   &  1.75  $\pm$  0.18 &  1.98  $\pm$  0.24 &	    \nodata\\
 6363.78  [O   I] & --0.291 &  0.61  $\pm$  0.09   &	\nodata          &  2.06  $\pm$  0.41 &  0.92  $\pm$  0.23 &	   2.24:\\
 6371.36  Si   II & --0.292 &	   0.05:      &	    \nodata      &	  \nodata &	   \nodata &	    \nodata\\
 6548.03  [N  II] & --0.318 &  1.58  $\pm$  0.11   &        \nodata   &  9.14  $\pm$  0.71 &  2.47  $\pm$  0.30 &	   4.51:\\
 6562.82   H	I & --0.320 &   285  $\pm$  12     &	282  $\pm$  50       &   281  $\pm$  14   &	    286  $\pm$  15 &   286  $\pm$  34\\
 6583.41  [N  II] & --0.323 &  4.20  $\pm$  0.23   &      11.7:       &  28.4  $\pm$  1.7  &	7.50  $\pm$  0.64 &  18.2  $\pm$  4.6\\
 6678.15  He	I & --0.336 &  2.93  $\pm$  0.20   &        \nodata   &	   \nodata &  2.72  $\pm$  0.34 &	    2.63:\\
 6716.47  [S  II] & --0.342 &  7.80  $\pm$  0.38   &      15.9:       &	   \nodata &	  16.8  $\pm$  1.0 &  42.8  $\pm$  7.0\\
 6730.85  [S  II] & --0.344 &  6.03  $\pm$  0.30   &      10.2:       &	   \nodata &	12.12  $\pm$  0.77 &  29.5  $\pm$  5.6\\
 7065.28  He	I & --0.387 &	    \nodata   &        \nodata   &	   \nodata &  2.45  $\pm$  0.32 &	     \nodata\\
 7135.78 [Ar III] & --0.396 &	    \nodata   &        \nodata   &	   \nodata &  6.54  $\pm$  0.45 &	    5.09:\\
 7281.35  He	I & --0.414 &	    \nodata   &        \nodata   &	  \nodata  &  0.61  $\pm$  0.20 &	     \nodata\\
 7318.39  [O  II] & --0.418 &	    \nodata   &        \nodata   &	  \nodata  &  2.11  $\pm$  0.23 &	    2.22:\\
 7329.66  [O  II] & --0.420 &	    \nodata   &        \nodata   &	  \nodata  &  1.71  $\pm$  0.22 &	    2.05:\\
 7751.10 [Ar III] & --0.467 &	    \nodata   &        \nodata   &	  \nodata  &  1.75  $\pm$  0.25 &	     \nodata\\
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Aperture size ($\arcsec$) &  &   $7.2 \times 1$  & $3.6 \times 1$ &  $3.6 \times 1 $    &   $4.0 \times 1$ &  $5.6 \times 1$       \\
Distance ($\arcsec$)$^a$&     &      --             &   20.4               &    --             &  --                  &  74.4               \\            
$F$(\Hb)$^b$          &       &   56.0   $\pm$     1.8  &    0.11   $\pm$     0.02 &  6.88   $\pm$   0.27  &   16.20   $\pm$     0.58 &	 1.58   $\pm$     0.15 \\
$C$(\Hb)              &       &	0.08   $\pm$     0.01 &    0.06   $\pm$     0.03 &  0.09   $\pm$   0.01  &    0.12   $\pm$     0.03 &	 0.18   $\pm$     0.04 \\
$W_{\rm abs}$ (\AA)     &       &	 2.0   $\pm$      0.1 &     1.4   $\pm$     0.2  &   2.0   $\pm$   0.1   &    0.7    $\pm$     0.1  &	  1.0   $\pm$     0.3 \\
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$-W$(\Ha) (\AA)     &       &   1075   $\pm$     48   &     380   $\pm$     65   &  1076   $\pm$     55  &     613   $\pm$     33   &	   92   $\pm$  	11 \\
$-W$(\Hb) (\AA)     &       &    200   $\pm$      9   &      12   $\pm$      4   &   169   $\pm$     10  &     125   $\pm$  	6   &	   18   $\pm$  	 3 \\
$-W$(H$\gamma$) (\AA)&     &     71   $\pm$      3   &       4    $\pm$      1   &    69   $\pm$      4  &      41   $\pm$  	2   &	    9   $\pm$  	 2 \\
$-W$([O III]) 5007 (\AA)&   &   1366   $\pm$     60   &      19   $\pm$      3   &   581   $\pm$     32  &       \nodata	    &	   \nodata	   \\
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$^a$ Relative distance of the knot with respect to the main region in the galaxy; $^b$~in units of 10$^{-15}$~erg~s$^{-1}$ cm$^{-2}$ and not corrected for extinction.
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