{% macro gray(duration, premble='') -%}
{% if duration > 1 %} {{preamble}} {{duration|round(3)}}s {% else %} {{preamble}} {{(duration*1000)|round(3)}}ms {%endif%}
{%- endmacro %} {%- macro black(duration, premble='') -%}{% if duration > 1 %} {{preamble}} {{duration|round(3)}}s {% else %} {{preamble}} {{(duration*1000)|round(3)}}ms {%endif%}
{%- endmacro %}