This book is about graphing data in science and technology. 
It contains graphical methods and principles that are powerful tools 
for showing the structure of data.
The material is useful for data analysis, 
when the analyst wants to study the data, 
and for data communication, 
when the analyst wants to communicate data to others. 
Many of the methods and principles in the book are new; 
many others are old but not widely known. 
The book contains many fascinating sets of data, 
drawn from many areas of science and technology, 
that are used to illustrate the methods and principles. 
Scientists, engineers, students, and others who study data 
will find that using the material in the four concise 
but thorough chapters raises substantially the effectiveness 
of their data analysis and communication.