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The Landers' mission was to take pictures of the landing site and explore Mars's internal surface and atmosphere. Each of the four landers was to carry instruments for the following measurements:
* Seismometer, IPG, France
* Panoramic camera, DLR, Germany
* Atmospheric sensors, FMI, Finland
* Atmospheric electricity sensor, CETP, France
* geodesic and ionospheric measurements, GRGS, France
* Soil properties

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