TNG-era ship crews didn't have a dedicated "science officer" like Spock. Data often filled the "science nerd" role in TNG and I would like to say 7of9 filled that role on Voyager; that said, there are dedicated Science stations (2 or 3) on the bridge of TNG-era ships, and Chrys would prefer to have a science officer on the bridge (since he doesn't have a walking ship's library at Ops).
http://wiki.maquis.com/images/...t_Contact_Bridge.jpg
From the bridge image TFF shared (link above), station 15 on the starboard side looks to be the spot for a Chief Science Officer (there are also configurable science stations at 1 & 6 for subordinates or for Syssha to have a secondary thing going on...maybe monitoring her favorite experiments? :) ); incidentally, there's an engineering station at 16 on the port side, so Mr. Reade or one of his subordinates can man that station as needed, too. :)
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TFF, would it be allowable for us to get some easy Momentum by having each main character department head perform a check of their systems from their stations by attempting a test related to their position (i.e., Nikos at Flight Control, Kel at Tactical, Syssha at Science (Sensors), Cora in Sick Bay) to report to the captain? (That is, unless you already have information on the condition of their systems to share with each character.) (The XO's task can be to get information from our NPC Ops Manager.)