Preliminary processed data and metadata are made available to facilitate initial instrument inter-comparisons, quality control checks and calibrations, as well as early interpretation of the combined dataset. Preliminary datasets are password protected. Users of these preliminary data agree NOT to share these data with third parties without first notifying the responsible data provider. These data have NOT received final quality control and are NOT final research data. As such, they are NOT publication ready and users agree NOT to publish with these data. When publication-ready data are available, users who have previously downloaded these preliminary data will be notified.