weight log question. please help me understand!!

when I look at my weight log, there's 2 lines. A blue one and a green one. Can someone please tell me what the difference between the blue one and the green one is?? Thanks!!!

The blue line is the actual graph created from the weights you log. 

The green line is called the Trend Line.  It is a running average of the weights you log.  Since most people have fluctuations in weight, the Trend Line, smooths those out and tells you how you are doing over all.  As long as that green line slants downward, you know you're making progress in spite of all the peaks and valleys in the blue line.

Now I got it!! Thanks for the help!