What I have:

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> Abundance values of microfossils A, B, and C
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> Depth of sediment core 0-130cm.
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What I want to accomplish:

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> Plot in a line graph the abundance values of A, B, and C in one x-axis along the depth of 0-130cm such that the y-axis is downwards from 0 to -130 (not upwards 0 to +130).
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> What I want to show is how the abundances of microfossils A, B, C varies as I go deeper along the length of the sediment core.
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> 
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Thank you very much!