plot_meta(S)
S (cell): the output of scat
function plot_meta(S)
compute number of subplot
M = numel(S);
nb_row = 0;
for m = 1:M
fn = fieldnames(S{m}.meta);
nb_row = max(nb_row, numel(fn));
nb_column = M;
for m = 1:M
plot_meta_layer(S{m}.meta, m, nb_row, nb_column);