• Variable names in text input fields: type "t" for .
• Variable names in labels: "t" represents (so, for example, "t_min" gives the minimum value for ) -- see "How To Use". Also, the value =3.14159... is represented as "Pi."
• The buttons under the graph allow various manipulations of the graph coordinates.
• The text input fields for functions can accept a wide variety of expressions to represent functions.
• There are four input fields which specify bounds on the variables for the functions:
  • The variable r (the radius) takes values between r_min and r_max, specified by the fields marked "r_min=" and "r_max=".
  • The variable (the angle, measured counterclockwise in the xy-plane) takes values between _min and _max, with _min and _max specified by the fields marked "t_min=" and "t_max=". Note that the value in each text input field is multiplied by =3.14159...
  These four text input fields can accept any decimal number input. The bounds apply to all functions.
• For another way to view surfaces, try the "wireframe" representation.

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