1.1 When two objects of material are attached together with glue, the glue can be oxidized in the moment just before the attachment to increase adhesion. It is done by blowing gas on to the glue. However, the dosage (amount) of this gas cannot always be fully controlled. There is a variation around the nominal value as marked with the Gaussian curves of Figure 1.6. In some applications, there is a saturation point for the gas dosage, as in Figure 1.6. Which nominal setting of the dosage is best from a robustness point of view if the adhesion should be maximized, x0 or x1?

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Adhesion Gas dosage XX Figure 1.6 The adhesion between the two objects may depend on the gas dosage.