Mixed Salad Leaves

I am hoping someone may be able to help, I am going to be growing some mixed salad leaves in window boxes this year. On the packet of seeds it tells me how much space between rows and how deep but not how much room I should allow between each seed.

Is it a case of just trailing them along the window box in one continual row? or should I be more precise for example leave 2cm between each seed?

Any advice most welcome.

Many thanks

That's great, thanks for the prompt reply. I will go and sprinkle now. ;o)

That's handy, I have two window boxes and have used half this morning and will sow the remainder in the second box in a couple of weeks.
Thanks for your advice.

I generally aim for a plant per square inch, so maybe two seeds in case one fails!  The result is usually that I have too many plants and some of the weaker ones get crowded out, but it seems to work OK.