user: ### NOW ANSWER:
Question: What is the Lower index Kcal/ Nm 3 entry, for the row with entries of an Upper index Kcal/ Nm 3 smaller than 19376, and a Lower index MJ/ Nm 3 of 74.54?
Columns: ['Fuel gas', 'Upper index Kcal/ Nm 3', 'Lower index Kcal/ Nm 3', 'Upper index MJ/ Nm 3', 'Lower index MJ/ Nm 3']
Types: ['text', 'real', 'real', 'real', 'real']
Sample row: ['Hydrogen', 11528.0, 9715.0, 48.23, 40.65]
SQL:

assistant: SELECT AVG("Lower index Kcal/ Nm 3") FROM "Table" WHERE "Lower index MJ/ Nm 3" = 74.54 AND "Upper index Kcal/ Nm 3" < 19376.0;