在一标准中读到以下内容，不解，望大神解答。
A calibration curve shall be developed for quantitative analysis. At least five calibration
solutions shall be prepared in equidistant concentration steps. Quantification is made on the
basis of the measurement of the peak areas. The linear regression fit of each calibration
curve is required to have a relative standard deviation (RSD) of less than or equal to 15 % of
the linear calibration function。
上段话中标红色的部分，其中“线性校准函数的RSD”是何含义？应如何计算？