Drew is absolutely right; meter as you would any ISO 100 colour neg film, and watch out for overcast/shady conditions.
This is where filtering will come in handy with Ektar, and is the one thing to watch out for with this film.
It produces colour casts in open shade that are not easily fixed in PS, so forewarned is forearmed.
The reason the OP asks about metering it as one would a slide film is perhaps due to the many internet comments comparing the vibrant colours of Ektar with slide film.
FWIW, I use it at ISO 80 and process normally in the Tetenal C-41 Press Kit; always got great results.
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