## 5 Summary  
At the Shanghai-EBIT, we have measured the X-ray spectra of L-shell transitions of Ne-like Xe in the range of 2.71-2.77 A using a high-resolution crystal spectrometer. The experimental spectra contain the 3D, 3F, and 3E lines, including satellites and TEOPT lines of Na-like and Mg-like Xe. These spectra are simulated by CRM based on FAC, and are in good agreement with the experimental results. The Na2 satellite with 3p as the spectator electron is first observed, which may be relevant to temperature diagnostics in tokamak.  
Our work focuses on the 3F/3D line-intensity ratios at different electron-beam energies. We use Voigt fitting profile with natural linewidth correction instead of conventional Gaussian profile during the fitting process. It is found that Voigt profile is crucial to reduce the intensity loss, and thus can obtain reasonable experimental line-intensity ratios. The discrepancies between theoretical and experimental results, previously reported approximately ranging from 10% to 20%, have been significantly reduced in this work to below 1.4% for electron-beam energies exceeding 6 keV and to around 7% for lower energies. We confirm the sensitivity of 3F intensity to higher-level radiative cascades and highlight the potential significant enhancement of the 4p-3s cascade transition channel for 3F. This suggests that the remaining discrepancies may originate from the undervaluation of the populations of cascade-related levels or the 3F upper level itself. The omission of indirect population transfer processes across charge states in the current CRM may lead to that. These findings provide a solid foundation for further minimizing these discrepancies and are crucial for understanding the atomic structure and plasma model of these ions. Similar discrepancy also exists in Tokamak spectra, which suggests that the unknown process enhancing 3F could be a new diagnostic method in fusion plasma. We leave the detailed analysis about this unaccounted process for future investigation.  
**Author Contributions:** Conceptualization, Y.Y. and S.H.; methodology, Y.Y. and K.Y.; software, Y.Y. and S.H.; validation, S.H., Y.Y. and Z.T. ([PERSON]); formal analysis, S.H., C.Z., H.J., Z.T. ([PERSON]) and Y.Y.; investigation, S.H., Z.T. ([PERSON]) and Y.Y.; resources, Y.Y., H.Z., K.Y. and Y.Z.; data curation, S.H.; writing--original draft preparation, S.H. and Z.T. ([PERSON]); writing--review and editing, S.H., Z.T. ([PERSON]), Z.T. ([PERSON]), S.M., J.L. and Y.Y.; visualization, S.H., Z.T. ([PERSON]) and Y.Y.; supervision, Y.Y. and H.Z.; project administration, Y.Y., H.Z. and K.Y.; funding acquisition, Y.Y., H.Z., K.Y. and Y.Z. All authors have read and agreed to the published version of the manuscript.  
**Funding:** This work is supported by National Natural Science Foundation of China (Grants 11704076, 11911530229, U1732140, Grants 2021 AMF01002, 1916321T500103201, Nos. U23A2077, 12205072), the National Key Research and Development Project of PRC (approved No. 2020 YFB1902100, 2022 YFA1602500), the National Magnetic Confinement Fusion Science Program of China (Nos. 2019 YFE0304002) and the IDP of CAS (approved No. YJKYYQ20180013).  
**Data Availability Statement:** The data presented in this study are available on request from the corresponding author.  
**Conflicts of Interest:** The authors declare no conflicts of interest.