Before revision:  We also show that this LP has an \Omega(\log^* m) integrality gap  even for the problem of selecting intervals on a line . Moreover, we show logarithmic gaps for problems without geometric structure, showing that some structure is needed to get good results using these techniques .
After revision:  We also show that this LP has an \Omega(\log^* m) integrality gap even for the problem of selecting intervals on a line ; here \log^* m is the iterated logarithm function .