Opposing Return Row Pair
A single line drops from the top row into a right-hand section then returns leftward to a sibling below. The descending feed and the returning leg share one inter-row gap; each takes its own horizontal corridor a clear lane apart instead of the two grazing at a 4px sliver.
Mermaid source
%%metro title: Opposing Return-Row Pair%%metro directional: true%%metro line: main | Main | #2db572%%metro grid: intake | 0,0%%metro grid: process | 1,0%%metro grid: collect | 2,0%%metro grid: left_out | 1,1%%metro grid: right_out | 3,1
graph LR subgraph intake [Intake] i0[Intake] end subgraph process [Process] pr0[Process] end subgraph collect [Collect] c0[Collect] end subgraph left_out [Left Out] %%metro entry: top | main lo0[Left] end subgraph right_out [Right Out] %%metro entry: top | main %%metro exit: left | main ro0[Right] end i0 -->|main| pr0 pr0 -->|main| c0 pr0 -->|main| ro0 ro0 -->|main| lo0CLI command
nf-metro render examples/topologies/opposing_return_row_pair.mmd -o opposing_return_row_pair.svg