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\label{cloudregime_histograms} \label{fig:hists}  The CTP-$\tau$ joint histograms of the hybrid cloud regimes, as derived from ISCCP observations and ACCESS1.3 using the ISCCP simulator.  The cloud regimes H1--H11 are arranged according to most frequent cloud-top properties in each histogram.  The relative frequency of occurrence (RFO) of each hybrid cloud regime in the observations (obs) and simulations (sim) is given in the top-right corner of each histogram; above the top-right corner of each histogram is the sum of the histogram, which gives the total cloud cover (TCC).