- The objective of this example is to demonstrate how to iterate efficiently over some dates (eg '2014-10-01' and '2014-11-01') a request for 'perturbed forecast', 'pressure' and 'sfc' level, for TIGGE, ECMWF Center.
- It can be used as a starting point, however you need to keep in mind that you have to adapt it to your needseg to set the keyword values according to your requirements ('param', 'levtype', 'step' etc).
- In this way you can extend this request to download a longer period of TIGGE.
 Keep in mind that the most efficient way is to organise your requests is per dates and times
ie select a set of dates and times and add, the 'steps', 'origins', 'levels' and 'parameters' that you need.  It is not efficient to organise your requests per parameter, per origin or per step. (eg to submit a different request per parameter for a list of dates)
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