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My code is

ListLinePlot[{
    {{0, 185}, {-10, 187}, {-20, 186}, {-30, 158}, {-40, 159}, {-60, 116}}, 
    {{0, 155}, {-10, 132}, {-20, 165}, {-30, 112}, {-40, 85}, {-60, 95}}}, 
  Filling -> {1 -> {2}}]

Why doesn't Filling work on my plot?

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    $\begingroup$ Perhaps it's just a sanity check. ListLinePlot[Transpose@{{3, 4, 6, 5, 7, 8}, {2, 2, 1, 1, 2, 2}}, PlotRange -> {0, 3}, Filling -> Axis] $\endgroup$ – Dr. belisarius Aug 9 '13 at 12:14
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Actually, this is more a long comment than a full answer. It seems to me that it is struggling with the fact that you (1.) supply x-coordinate in (2.) decreasing/"unsorted" order. Sorting it fixes it, try: 

ListLinePlot[{
    Sort@{{0, 185}, {-10, 187}, {-20, 186}, {-30, 158}, {-40, 159}, {-60, 116}}, 
    Sort@{{0, 155}, {-10, 132}, {-20, 165}, {-30, 112}, {-40, 85}, {-60, 95}}}, 
    Filling -> {1 -> {2}}]

Alternatively, in your case (of strictly decreasing x-coords), you could use Reverse.

For the "Why?", I do not know, maybe somebody else can help? (I cannot see a word on that in ListLinePlot documentation, in particular in the possible issues section)

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  • $\begingroup$ I note that you specify the Filling option differently than the OP. Any reason for that? $\endgroup$ – Sjoerd C. de Vries Aug 9 '13 at 12:35
  • $\begingroup$ Good eyes! I was playing around a bit with other things and trying out stuff, forgot to change back. {1->{2}} and {2->{1}} shouldn't change a thing. Thanks for pointing that out! $\endgroup$ – Pinguin Dirk Aug 9 '13 at 12:40
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    $\begingroup$ See "Unordered data may display in unexpected ways" $\endgroup$ – Michael E2 Aug 9 '13 at 17:42

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