Clojurians Log v2

Hi everyone, I wanna spec sth like this :

[[:__      :TXC    :BTC    :ALT    :PAXG   ]
 [:TT1     0M      0M      0M       0M     ]
 [:TT2     0M      0M      0M       0M     ]
 [:TT3     0M      0M      0M       0M     ]
 [:TT4     0M      0M      0M       0M     ]
 [:Others  0M      0M      0M       0M     ]
 ]

but the following spec won't work :

(spec/def ::X-Header-Row     (spec/cat :dont-care #{:__} :exposure-id-s (spec/+ ::Exposure-ID)))
(spec/def ::X-Row            (spec/cat :g-id ::Group-ID :weights (spec/+ decimal?)))
(spec/def ::X                (spec/cat :header ::X-Header-Row  :rows (spec/+ ::X-Row)))

What is it that I'm not getting about how spec/cat works and how can I spec that table ? Thanks a lot in advance