盗版 用户 wrote:
Why don't clean the curve to get rid of useless points fistly by some tools,like mspaint or photoshop?
Feel free to do so. The sheet Richard sent is an attempt to be a standalone approach. If you are willing to use third party software, you may chose to use a program like DataThief right away.
Alvaro Diazo one posted a sheet long time ago which enabled you to do some kind of manual digitizing. Maybe of interest. The most recent link I could find is this where Norm reposted it: http://communities.ptc.com/message/226096#226096