diff --git a/include/evalhyd/detail/probabilist/intervals.hpp b/include/evalhyd/detail/probabilist/intervals.hpp
index 2052631946b8bbfb2150fe9823ba593ddd2c8c40..f0d23142ef40d2b800c51d279817451cffe83e88 100644
--- a/include/evalhyd/detail/probabilist/intervals.hpp
+++ b/include/evalhyd/detail/probabilist/intervals.hpp
@@ -70,8 +70,8 @@ namespace evalhyd
                     auto b = xt::broadcast(q_lvl / 100., std::vector<std::size_t>({2, q_lvl.size()}));
                     auto res = xt::where(xt::equal(a, xt::transpose(b)));
                     std::cout << "res: " << res.size() << std::endl;
-                    std::cout << "res: " << res[0] << std::endl;
-                    std::cout << "res: " << res[1] << std::endl;
+                    std::cout << "res: " << res[0][0] << std::endl;
+                    std::cout << "res: " << res[1][0] << std::endl;
                     if (res.size() != 2) 
                     {
                         throw std::runtime_error(