A straight electric field line is supposed to represent a constant electric field. Does your data for both configurations, more or less, agree with this

Yes, the electric field is uniform.

Explanation:

The region around a charge in which another charge particle experiences a force is called electric field.

The electric field strength is given by force experienced by per unit charge.

A line charge produces an electric field and the electric field is uniform.

The electric field due to a line charge is

where, r is the distance and k is the constant.  

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.