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    "# Practice Problems\n",
    "### Lecture 8\n",
    "Answer each number in a separate cell\n",
    "\n",
    "Rename this notebook with your last name and the lecture \n",
    " \n",
    " ex. Cych_B_08\n",
    "    \n",
    "Turn-in this notebook on Canvas.  "
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    "1.  Adding notes in matplotlib.pyplot\n",
    "    - Similar to the lecture:\n",
    "        - Read the file 'Datasets/seismicRecord/earthquake.txt'into a pandas DataFrame\n",
    "        - Change the units of the x-axis to time in minutes\n",
    "    - Make a plot of velocity against time\n",
    "        - Include a label for the x and y-axis. \n",
    "        - Plot the line red\n",
    "        - Use **help( )** to learn about the matplotlib function **title( )** then add this title: 'Earthquake observed at Pinyon Flat Observatory'\n",
    "    - Add a note\n",
    "        - Place the note at x = 4 and y = 170000 \n",
    "        - Write the text 'P-S delay interval'\n",
    "        - Color the text blue\n",
    "        - rotate the text so that it is vertical (hint: use rotation = 90)\n",
    "2. Panda DataFrames\n",
    "    - Import the file 'Datasets/TravelTimeDelta/DeltaTime.txt' into a panda DataFrame\n",
    "    - Get acquainted with the DataFrame:\n",
    "        - print out the name of the columns\n",
    "        - print out the first few lines of the DataFrame\n",
    "        - change the column headers \n",
    "        - print out the new column headers\n",
    "    - Convert the P wave arrival from minutes and seconds to decimal minutes. Add the P wave arrival, in decimal minutes, to the data frame\n",
    "    - Calculate the S wave arrival by:\n",
    "        1. Converting S-P to decimal minutes\n",
    "        2. Adding P in decimal minutes to S-P in decimal minutes\n",
    "     \n",
    "3. Additional matplotlib.pyplot practice\n",
    "    - Plot Degrees against decimal minutes for both the Primary wave arrival and the Secondary wave arrival\n",
    "    - Color the primary wave green and label it \"P wave\"\n",
    "    - Color the shear wave blue and label it \"Shear wave\"\n",
    "    - Add a legend in the lower right hand corner of your figure \n",
    "    - Add a title to your figure \n",
    "    - Add a label to the x and y axis \n",
    "    - Save the figure\n",
    "    - Remove the legend from your plot. Insert the text  \"Primary wave\" and \"Shear wave\" above the appropriate line\n",
    "    - Save the new figure"
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