Line-of-sight output along the z-axis

doc/RTD/source/CommandLineOptions/index.rst

@@ -37,6 +37,7 @@ can be found by typing ``./swift -h``:
     -u, --fof                         Run Friends-of-Friends algorithm to
                                       perform black hole seeding.
     -x, --velociraptor                Run with structure finding.
+    --line-of-sight                   Run with line-of-sight outputs.
     --limiter                         Run with time-step limiter.
     --sync                            Run with time-step synchronization
                                       of particles hit by feedback events.