selecting object types in NED query

I am wondering how to select only a certain kind of objects from NED (e.g., galaxy clusters).
This is done on the NED web interface by means of the parameter: in_objtypes1=GClusters

but I am not able to find a way to specify this option while using astroquery.ned

Start at the astroquery.ned query interface and compare its request parameters with NED’s web option in_objtypes1=GClusters. Done means callers can select a specific NED object type, such as galaxy clusters, through astroquery.ned and the request reaches NED with the corresponding option.

Written by the indexing model from the issue text.