You can change the "TIME" row header string using the ChartData.TimeValueRowHeader property.
this.ChartData.TimeValueRowHeader = "YYYY";
You can change "FRACT.DEF","% DEF." property using GetCalculatedValueRecord.
this.ChartData.GetCalculatedValueRecord(0).ValueDescription = "XXXX";
You can change the "NO.INSP" row header string using the ChartData.NumberSamplesValueRowHeader property.
this.ChartData.NumberSamplesValueRowHeader = "ZZZZ";