list all groups with the right "unread article" column values

When listing all groups with "L" then "*" as keywork, slrn shows the list of all groups made available by the configured server. In the screen each lines corresponds to one group and there are several columns, the first showing whether this is a subscribed or unsubscribed group, the second showing the number of unread articles. It seems that except for groups that have already been visited all the values in this second column are set to "0". Is there some way to get all these values being up to date?
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