What does the second number (vMB) of an unconfirmed transaction in Electrum mean?

What does, for example, "Unconfirmed [1.8 sat/vB, 4.13 vMB]" mean for a transaction in Electrum?

I realize the "1.8 sat/vB" means the transaction fee, but what is the "4.13 vMB"? How deep the transaction is in the mempool?



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