When trying to produce a Surfer post map with Proportional Scaling for symbols, I get an error message "Minimum data value cannot equal maximum". The scaling data are in the range of 0 to 10e-18. Surfer requires the difference between the zMax and zMin to be at least 1e-5 (0.00001). Updated February 6, 2017 Have more questions? Submit a request 0 Comments Please sign in to leave a comment.