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400 LES PORTIQUES

20                                            L = H = H =10            20                                          L =10; H = H = 5
     W                                        h1 h2 h3                      W                                      h1 h2 h3

18                                    Hα                               18                                  Hα
16                                           bL                        16                                         bL
14                                                                     14

12 12

                                k=1                                                             k=1

 10                     2                                              10                    2
                                                                                        4
  8            86 4                                                                86
 7.5          10                                                                   10

  6     ∞                                                                      ∞

  4                                                          Z =0.75    8                                                             Z =0.75
3.75                                                                   7.5
                          k=1                                                                   k=1                                  Z =0.375
 2.5                 2                                                  6                                                            Z =0.25
  2        64                                                                             2
            8
            10                                                                         4
                                                                                  108 6
           ∞
                                                                                  ∞

        ∞ 10 8 6 4              2     k=1                    Z =0.375    4     ∞ 10 8 6 4            2     k=1
                                                             Z =0.25   3.75

                                                                        2.5
                                                                         2

                                                             LL

                                                                                                                       HH
00

      0 1 2 3 4 5 6 7 8 9 10                                                 0 1 2 3 4 5 6 7 8 9 10

                                      Figure 2.17.8.                                                       Figure 2.17.9.

20                                    L = H = H =10                    20                                       L =10; H = H = 5
     W                                h1 h2 h3                              W                                   h1 h2 h3

18                                                                     18

                                 Hα                                                                     Hα

16                                                                     16

                                          bL                                                                    bL

14 14

12 12

                                k=1                                                             k=1

 10                     2                                              10                 2

  8        86 4                                                                        4
 7.5       10                                                                     86
                                                                                  10
  6
        ∞                                                                      ∞
  4
3.75                                                         Z =0.75    8                                                             Z =0.75
                                                                       7.5
 2.5                       k=1                                                                  k=1                                  Z =0.375
  2                                                                     6                                                            Z =0.25
                     2                                                                    2

           86 4                                                                      4
           10                                                                     86
                                                                                  10
           ∞
                                                                                  ∞

        ∞ 10 8 6 4                 2  k=1                    Z =0.375    4     ∞ 10 8 6 4               2  k=1
                                                             Z =0.25   3.75

                                                                        2.5
                                                                         2

                                                             LL

                                                             HH

00

      0 1 2 3 4 5 6 7 8 9 10                                                 0 1 2 3 4 5 6 7 8 9 10

                                      Figure 2.17.10.                                                      Figure 2.17.11.
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