let c = compose c1 saturations_for_c1 c2 saturations_for_c2 in
let spline_len = saturations_for_c1 + saturations_for_c2 in
let c = mk_lambda_spline c (namer (names_c1 @ names_c2)) spline_len in
let c = compose c1 saturations_for_c1 c2 saturations_for_c2 in
let spline_len = saturations_for_c1 + saturations_for_c2 in
let c = mk_lambda_spline c (namer (names_c1 @ names_c2)) spline_len in