As systematically examined by Nishizaki et al., [*both*]{} the upper and lower critical points of first order line tend to decrease with underdoping \[9,10\]. It is well known at present through the doping dependences of penetration depth \[47\] and heat capacity jump \[48\] that the thermal superconducting fluctuation is enhanced with underdoping. On the other hand, effects of point disorder due to oxygen deficiency also become more remarkable with underdoping. Namely, both $\theta_f(T_{c0})$ and $\Delta^{(p)}$ increase with underdoping. It is natural to interpret the doping dependence of $B_{\rm ucp}$ as being due to a $\Delta_{\rm eff}(T)=\Delta^{(p)}/\theta_f(T)$-increase (i.e., a relative enhancement of pinning) with underdoping. However, additional dependences on the anisotropy $\Gamma$ and on $\theta_f$ of $B_{\rm lcp}^{(p)}$ (2.27) imply that $B_{\rm lcp}^{(p)}$ can decrease with increasing $\Delta_{\rm
eff}$, because $\Gamma$ remarkably increases with underdoping \[48\]. An explanation of other experimental findings on the lower critical points was given in ref.24. Now, we are in a position of discussing possible phase diagrams under ${\bf B} \perp$ layers, which are described in Fig.3 \[24\]. Before explaining Fig.3, we need to mention a bit about results of the elastic approach. As emphasized in, for instance, ref.12, the melting line of the BrG phase 