% find the index of the offset.FrameNumber row matching each Secc.Seccion element
[~,idx] = ismember(Secc.Seccion,offset.FrameNumber);
if any(idx == 0)
% what to do if no matching frame?
end
% create new columns of Secc, writing in the offset rows in order
Secc(:,4:6) = offset(idx,2:4);
% update the names of these new columns with the names of the offset columns
Secc.Properties.VariableNames(4:6) = offset.Properties.VariableNames(2:4);
