Errors and best-fit parameter estimates for Brownlee’s normal-law and the Kermack–McKendrick square-hyperbolic-secant-law.

Error is in deaths, a is the total number of infected people, r is the maximum rate of infection (infected per day), and c is the day this maximum occurs.

死亡数据中存在误差；其中变量a代表总感染人数，变量r代表最大感染率（单位：每日新增感染数），变量c为该最大感染率出现的日期。