Obviously we have to wait for some key parameters like what the average fee is actually charged in England.

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Key parameters can even be adjusted on the fly for specific testing scenarios to make breaking world records in performance even easier.

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Transactions and gross dollar volumes are key parameters for MasterCard and Visa and both companies charge their banking clients on the basis of these metrics.

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Ministers also called on the Greek government and the so-called troika - the European Commission, European Central Bank and the IMF - to agree the key parameters of an "ambitious" adjustment programme as soon as possible.

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The key was to allow Dirksen to shape the bill, within certain parameters, so that he could leave his imprint on the measure.

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