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Each key can appear several times in a BUFR message. Examples are: 

1. airTemperature in a an upper air messagereport
2. backscatter in a scatteromenter scatterometer observation

ecCodes provides access by rank of all the keys in the data section of a BUFR message with the following syntax:

...

#to get the third airTemperature in the message
t=codes_get(bufr,'#3#airTemperature') 

#to get the second backscatter in the message
b=codes_get_array(bufr,'#2#backscatter')  

This is a change compared with the key syntax provided before version 0.12.0 where the access by rank was expressed as 'airTemperature#3'

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