Are my tomatoes dead?

Hi
I have had a major tomato crisis and would welcome any advice.
I put my seedlings in a plastic greenhouse and had been putting them
outside for a few hours a day.
Unfortunately there was a very hot spell and by the time I had got to
them they had seriously wilted. I opened the greenhouse, moved them
into the shade and gave them a good drink of water.
Now a lot of them have crispy brown leaves and are looking somewhat
dead.
Are they beyond salvation.
I would welcome any advice.
Many thanks
Chris




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CringleB