D.4 Values of Snow Pressure and Wind Pressure for the Towns,Cities of Nation-wide........68 D.5 The Distribution Diagrams of Reference Snow Pressures,Wind Pressures and the Zoning Diagram for the Coefficients of Quasi-permanent Values of Snow Loads throughout the Country.88 Appendix E Empirical Formulae for the Structural Fundamental Natural Period of Vibration.89 E.1 High-rise Structure.............................89 E.2 Tall Buildings 90 Appendix F Approximate Values for Vibration Mode Factors of Structures......91 Appendix G Explanation of Wording in This Code