-static std::map<std::string, std::string, std::less<>> ampi_colors = {{"migrate", "0.2 0.5 0.2"},
- {"iteration", "0.5 0.5 0.5"}};
+static const std::map<std::string, std::string, std::less<>> ampi_colors = {{"migrate", "0.2 0.5 0.2"},
+ {"iteration", "0.5 0.5 0.5"}};