How can access to the information on the gap?

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I am solving a mixed-integer linear programming (MILP) problem on matlab using the solver gurobi. During the iterations, I see information like:

Optimal solution found (tolerance 1.00e-04) Best objective 6.076620143590e+02, best bound 6.076620143590e+02, gap 0.0000%

My question is: how can access to the information on the gap? I would like to store it at every iteration in an array. However, if I just call X = gurobi(model);, where model contains my MILP model, I do not see information on the gap in X.