Examinations of CO Completeness Based on Three Independent CO Surveys

We report the global properties recovered by an ongoing CO survey of Milky Way Imaging Scroll Painting (MWISP) toward Galactic outskirts. %To better understand observational biases, Our results are also compared to those extracted a uniform decomposition method from CfA 1.2 m and FCRAO 14 outer Galaxy (OGS). find that more extended unseen structures present in MWISP data. The total flux across disk is 1.6 times larger than OGS surveys case same resolution. discrepancies scaling with distance. For example, outermost OSC arm, ratios for MWISP-to-CfA MWISP-to-OGS increase up 43.8 7.4, respectively. Nonetheless, census molecular gas our still far complete MWISP, completeness $<$58%. mass tabulated clouds between different similar ratio. application these H$_{\rm 2}$ yields correction factor at least 1.4, meaning should be 40% massive previously determined. Including correction, even significant fraction matter contributed baryonic matter. spectrum plane described non-truncating power-law $\gamma$=$-$1.83$\pm$0.05, upper $M_0$=(1.3$\pm$0.5)$\times$10$^{\rm 6}$ $M_\odot$.