Renault Twingo previous engine from the Renault 5. Alongside the new engine came the Twingo Matic model, equipped with a 3-speed automatic gearbox. Also, various improvements were made including the addition of a third brake light. Two years later, the Twingo underwent its first major restyling revisions to the interior and dashboard. The front and rear lights were revised, and front orange indicator lights were merged into the headlamp housing. Two months later, the top of the range Twingo Initiale model launched. In September 2000, the Twingo underwent its second major restyling. Additions included larger 14" wheels, revised door trims with larger
Latitude of the Gulf Stream and the Gulf Stream north wall index analysis was then used to find the pattern of variation common to the six longitudes. This is preferable to simple averaging of the six latitude estimates which would emphasise the eastern longitudes where the north-south movements are largest, and possibly obscure smaller but coherent north-south shifts further west. Correlation coefficients are calculated between the six time-series and the principal components are the eigenvectors of the resulting correlation matrix. (Empirical orthogonal function analysis proceeds instead from the variance-covariance matrix which again is biased to the eastern longitudes.) Each principal component is calculated as a weighted average of the standardised latitude series