I'm looking for help in creating curved lines in the example below:
I've tried using rounded rectangles but it the final result doesn't look quite the same.
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Draw a rounded rectangle...
(Or a regular rectangle and then round two corners equally.)
Just a stroke and no fill....
Delete sections of the shape by using the Direct Selection Tool (white arrow) to select them and then hitting Delete.
Using the Blend Tool, click the top anchor on the left (1), then the top anchor on the right (2). This tells Illustrator what anchor to blend to what anchor, creating a proper blend.
Note that if you merely use the menu to create the blend, the path directions will result in one side being seen as "flipped" and will result a blend which is unexpected. Using the Blend Tool to specificy the anchors to blend to/from circumvents the issue with path directions.
Object > Blend > Blend Options from the menu. Set the Blend Options Spacing to Specified Steps in the drop down menu, then enter the number of iterations you want.
As a live blend you can further refine by moving the anchor points of the two paths around.
Then, for separate, individual paths, select the entire object, choose
Object > Expand from the menu, and simply click
The end result is a group of strokes following the curves smoothly. You can then ungroup if necessary.