\begin{table}%T3
      \caption{\label{tautab}Photon-photon optical depth as a function of energy and redshift$^{{a}}$.}
\small%\centerline
{
\begin{tabular}{l l l l l l l l l l  }     
            \hline
            \hline
            \noalign{\smallskip}
	Energy     & $\tau(z,E_\gamma)$ & $\tau(z,E_\gamma)$ & $\tau(z,E_\gamma)$ & $\tau(z,E_\gamma)$ & $\tau(z,E_\gamma)$ & $\tau(z,E_\gamma)$ & $\tau(z,E_\gamma)$ & $\tau(z,E_\gamma)$ & $\tau(z,E_\gamma)$  \\
            \noalign{\smallskip}
    [TeV]      &   $z=0.01$	 	 &	$z=0.03$	            &  $z=0.1$ 		&	 $z=0.3$		    &   $z=0.5$       &   $z=1.0$	 &	   $z=1.5$    &  $z=2.0$	  &   $z=3.0$          \\
             \hline
           0.0200     & 0.0000        &   0.0000      	    & 0.0000     	& 0.000000          & 0.0000021  	&   0.004933 &	  0.0399	& 0.1157 	  &  0.2596 			  \\
 0.0240     & 0.0000        &   0.0000    	        & 0.0000     	& 0.000000 	    	& 0.000188  	&   0.01284  &	  0.0718	& 0.1783 	  &  0.3635 			  \\
 0.0289     & 0.0000        &   0.0000    	        & 0.0000     	& 0.000000   		& 0.001304   	&   0.0279 	 &	  0.1188	& 0.2598 	  &  0.4919 			  \\
 0.0347     & 0.0000        &   0.0000    	        & 0.0000     	& 0.000488  		& 0.004558  	&   0.0533 	 &	  0.1833	& 0.3635 	  &  0.6517 			  \\
 0.0417     & 0.0000         &   0.0000    		    & 5.254E-05 	& 0.002276  		& 0.01157   	&   0.0921 	 &	  0.2689	& 0.4967 	  &  0.8548 			  \\
 0.0502     & 0.0000         &   9.445E-05 		    & 5.408E-04 	& 0.006575   		& 0.02436   	&   0.1480 	 &	  0.3836	& 0.6745 	  &   1.118 			  \\
 0.0603     & 1.0976E-04     &   4.241E-04 		    & 1.915E-03 	& 0.014592  		& 0.04512   	&   0.2275 	 &	  0.5434	& 0.9179 	  &   1.465 			  \\
 0.0726     & 3.0882E-04     &   1.103E-03 		    & 4.548E-03 	& 0.02771   		& 0.07684    	&   0.3430 	 &	  0.7707	&  1.251 	  &   1.917 			  \\
 0.0873     & 6.5619E-04     &   2.258E-03 		    & 8.903E-03 	& 0.04808   		& 0.1248    	&   0.5137 	 &	   1.092	&  1.703 	  &   2.503 			  \\
 0.104      & 1.2130E-03     &   4.097E-03 		    & 1.582E-02 	& 0.07958    		& 0.1984    	&   0.7640 	 &	   1.537	&  2.302 	  &   3.249 			  \\
 0.126      & 2.1063E-03     &   7.039E-03 		    & 2.685E-02 	& 0.1284    		& 0.3109    	&    1.120 	 &	   2.133	&  3.073 	  &   4.181 			  \\
 0.151      & 3.5291E-03     &   1.167E-02 		    & 4.406E-02 	& 0.2031    		& 0.4780    	&    1.607 	 &	   2.905	&  4.042 	  &   5.318 			  \\
 0.182      & 5.7051E-03     &   1.872E-02 		    & 7.010E-02 	& 0.3134    		& 0.7163    	&    2.247 	 &	   3.875	&  5.225 	  &   6.673 			  \\
 0.219      & 8.9183E-03     &   2.907E-02 		    & 0.1082     	& 0.4696    		&  1.040    	&    3.056 	 &	   5.055	&  6.627 	  &   8.241 			  \\
 0.263      & 1.3517E-02     &   4.378E-02 		    & 0.1618     	& 0.6809    		&  1.461    	&    4.042 	 &	   6.438	&  8.226 	  &   9.997 			  \\
 0.316      & 1.9793E-02     &   6.367E-02 		    & 0.2338     	& 0.9517    		&  1.981    	&    5.192 	 &	   7.989	&  9.977 	  &   11.89 			  \\
 0.381      & 2.7938E-02     &   8.935E-02 		    & 0.3256     	&  1.281    		&  2.594    	&    6.474 	 &	   9.650	&  11.81 	  &   13.89 			  \\
 0.458      & 3.7957E-02     &   0.1205     		& 0.4356     	&  1.661    		&  3.284    	&    7.836 	 &	   11.34	&  13.67 	  &   15.93 			  \\
 0.550      & 4.9558E-02     &   0.1563     		& 0.5607     	&  2.082    		&  4.023    	&    9.214 	 &	   13.01	&  15.51 	  &   18.08 			  \\
 0.662      & 6.2291E-02     &   0.1953     		& 0.6961     	&  2.524    		&  4.779    	&    10.55 	 &	   14.63	&  17.39 	  &   20.45 			  \\
 0.796      & 7.5753E-02     &   0.2364     		& 0.8373     	&  2.967    		&  5.517    	&    11.82 	 &	   16.25	&  19.49 	  &   23.27 			  \\
 0.957      & 8.9194E-02     &   0.2768     		& 0.9750     	&  3.389    		&  6.210    	&    13.03 	 &	   18.04	&  22.02 	  &   26.81 			  \\
  1.15      & 0.1019    	 &   0.3152     		&  1.105     	&  3.779    		&  6.846    	&    14.29 	 &	   20.21	&  25.22 	  &   31.33 			  \\
  1.38      & 0.1136    	 &   0.3501     		&  1.223     	&  4.129    		&  7.432    	&    15.73 	 &	   22.98	&  29.37 	  &   37.23 			  \\
  1.66      & 0.1240    	 &   0.3810     		&  1.327     	&  4.444    		&  8.010    	&    17.54 	 &	   26.58	&  34.78 	  &   45.09 			  \\
  2.000     & 0.1329    	 &   0.4076     		&  1.419     	&  4.747    		&  8.652    	&    19.87 	 &	   31.31	&  41.95 	  &   55.80 			  \\
  2.40      & 0.1409    	 &   0.4318     		&  1.504     	&  5.079    		&  9.452    	&    22.96 	 &	   37.67	&  51.72 	  &   70.71 			  \\
  2.89      & 0.1486    	 &   0.4560     		&  1.596     	&  5.498    		&  10.52    	&    27.08 	 &	   46.30	&  65.17 	  &   92.14 			  \\
  3.47      & 0.1579    	 &   0.4863     		&  1.714     	&  6.075    		&  11.96    	&    32.66 	 &	   58.24	&  84.48 	  &   124.0 			  \\
  4.17      & 0.1710    	 &   0.5284     		&  1.879     	&  6.875    		&  13.92    	&    40.39 	 &	   75.45	&  113.2 	  &   172.1 			  \\
  5.02      & 0.1896    	 &   0.5887     		&  2.113     	&  7.952    		&  16.57    	&    51.39 	 &	   101.3	&  157.7 	  &   245.9 			  \\
  6.03      & 0.2162    	 &   0.6732     		&  2.431     	&  9.421    		&  20.24    	&    67.70 	 &	   141.4	&  227.3 	  &   357.0 			  \\
  7.26      & 0.2512    	 &   0.7847     		&  2.858     	&  11.45    		&  25.57    	&    92.73 	 &	   204.9	&  335.3 	  &   519.3 			  \\
  8.73      & 0.3017    	 &   0.9447     		&  3.464     	&  14.41    		&  33.52    	&    132.2 	 &	   304.3	&  496.4 	  &   747.0 			  \\
  10.5      & 0.3732    	 &    1.171     		&  4.334     	&  18.87    		&  45.81    	&    195.0 	 &	   454.1	&  724.1 	  &   1048. 			  \\
  12.6      & 0.4795    	 &    1.513     		&  5.663     	&  25.76    		&  65.21    	&    292.5 	 &	   666.6	&  1027. 	  &   1426. 			  \\
  15.2      & 0.6455    	 &    2.048     		&  7.723     	&  36.60    		&  95.98    	&    435.4 	 &	   948.5	&  1407. 	  &   1873. 			  \\
  18.2      & 0.8984    	 &    2.871     		&  10.93     	&  53.79    		&  143.7    	&    630.5 	 &	   1299.	&  1852. 	  &   2372. 			  \\
  21.9      &  1.297    	 &    4.162     		&  15.99     	&  80.41    		&  214.3    	&    878.2 	 &	   1705.	&  2339. 	  &   2897. 			  \\
  26.4      &  1.917    	 &    6.177     		&  23.86     	&  119.9    		&  311.5    	&    1172. 	 &	   2145.	&  2843. 	  &   3412. 			  \\
  31.7      &  2.856    	 &    9.181     		&  35.47     	&  174.8    		&  435.3    	&    1494. 	 &	   2587.	&  3323. 	  &   3887. 			  \\
  38.1      &  4.211    	 &    13.47     		&  51.78     	&  245.0    		&  580.9    	&    1824. 	 &	   3004.	&  3752. 	  &   4303. 			  \\
  45.8      &  6.038    	 &    19.14     		&  72.76     	&  327.4    		&  739.9    	&    2134. 	 &	   3362.	&  4102. 	  &   4618. 			  \\
  55.1      &  8.285    	 &    26.00     		&  97.51     	&  416.9    		&  899.0    	&    2403. 	 &	   3638.	&  4352. 	  &   4835. 			  \\
  66.2      &  10.82    	 &    33.59     		&  124.3     	&  506.3    		&  1045.    	&    2616. 	 &	   3825.	&  4499. 	  &   4940. 			  \\
  79.6      &  13.48    	 &    41.42     		&  151.2     	&  587.7    		&  1169.    	&    2756. 	 &	   3915.	&  4540. 	  &   4945. 			  \\
  95.7      &  16.04    	 &    48.81     		&  175.8     	&  655.4    		&  1263.    	&    2823. 	 &	   3915.	&  4540. 	  &   4945. 			  \\
  115.      &  18.24    	 &    54.98     		&  195.8     	&  705.7    		&  1320.    	&    2823. 	 &	   3915.	&  4540. 	  &   4945. 			  \\
  138.      &  20.01    	 &    59.82     		&  210.8     	&  735.5    		&  1340.    	&    2823. 	 &	   3915.	&  4540. 	  &   4945. 			  \\
  166.      &  21.20    	 &    63.03     		&  219.8     	&  744.0    		&  1340.    	&    2823. 	 &	   3915.	&  4540. 	  &   4945. 			  \\
            \hline
             \end{tabular}}
\smallskip
$^{{a}}$ The absorption multiplicative factor is e$^{-\tau(z,E_\gamma)}$.
   \end{table}