  We report systematic 17O-NMR measurements on the high-Tc cuprate
(Ca_xLa_{1-x})(Ba_{1.75 - x}La_{0.25 + x})Cu_3O_y, for four different families
(different x). Using Knight shift data, we show that the pseudogap lines for
all families are inconsistent with a quantum critical point inside the
superconducting dome. In addition, at constant doping the pseudogap temperature
does not vary with x, in contrast to Tc. We therefore argue that pseudogap and
superconductivity are separate phenomena in these cuprates. Using Knight shift
data, we show that the pseudogap opening temperature T* is much higher than Tc
near optimal doping, unlike structurally similar YBCO. In addition, at constant
doping the pseudogap temperature does not vary with x, in contrast to Tc. This
puts constraints on the nature of the pseudogap and position of the quantum
critical point inside the superconducting dome.
