c1 is a quantity of café au lait/latte/café con leche/cappuccino/flat white/coffee with heated dairy [or similar] product/creamer/whitener la1=g1, addition warm by standard g2.
x1=c1 is made of/contains/is a quantity of espresso [coffee beverage] from beans x2=c2 with crema x3
(the foam with a creamy texture that forms as a result of the pressure).