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426 LES PORTIQUES

50                    L = H =10      b                                                                            50                    L =10 ; H = 5      b
                      h1 h2         H 1.10                                                                                              h1 h2             H 1.10
      α                                                                                                                 α
                  Hα             α             1                                                                                    Hα                 α             1
40                                                                                                                        Z =0.25
        Z =0.25                                0.90                                                               40                                                 0.90
        Z =0.375                    0.83                                                                                                                  0.83
                                                                                                                          Z =0.375
        Z =0.75                                0.80                                                                                                                  0.80
30                bLb                                                                                                               b Lb
                                                                                                                                                                     0.70
20                                                                                                                0.70 Z =0.75
                                                                                                                                                          k=1 0.60
                                              0.60                                                                30
                                                                                                                                                             2
                                    k=1
                                                                                                                                                                     0.50
                                    2 0.50
                                                                                                                                                             4
                                     4                                                                            20
                                                                                                                                                            6 0.40
                                            0.40
                                                                                                                                                             8
                                     6                                                                                                                       10

                                     8                                                                                                                               0.30
                                    10

                                            0.30

                                                                                                                  0.20 0.20

10                                  0.17 10                                                                                                               0.17

                                                                                                                  0.10 0.10

                                                                                                               L                                                                                                                 L
                                                                                                              H                                                                                                                  H
0 k =∞                                                                                                            0 k =∞
   0 1 2 3 4 5 6 7 8 9 10                                                                                            0 1 2 3 4 5 6 7 8 9 10

                      Figure 2.22.13.                                                                                                   Figure 2.22.14.
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