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The agreement has become much better. If we calculate again the values of R, and Ra for all zones together we get:

R, = — 0.002 R, = — 0.002


R, — R2 = o.ooo

we may thus conclude that the agreement between the values of qe and q'0 is satisfactory if we take for h the value (g).

Therefore this value of h, denoted by (15) in Chapter II, has been adopted for the calculation of the values of ƒ in Tftble II (see page 26).