example text and improvements of readme

README.md

 # How do I get a DOI for a secondary dataset that I have created?
-
-NILU, on behalf of the ACTRIS project, may issue a DOI on secondary datasets, this is through the [DataCite metadata service](https://schema.datacite.org/). If you want us to issue a DOI, there are two things to consider. First, we need for you to supply us with metadata that follows the XML format (see whats required below). Secondly, we will need to create a landing page for the DOI, and therfore you will also need to supply some information with regards to this. The data resource you supply us with will be available through the presentation page on a ftp server.
+NILU, on behalf of the ACTRIS project, may issue a DOI on secondary datasets or other data products related to ACTRIS. Issuing of the DOI is done through the [DataCite metadata service](https://schema.datacite.org/). 
+If you want us to issue a DOI, there are two things to consider. First, we need for you to supply us with metadata that follows the XML format (see whats required below). Secondly, we will need to create a landing page for the DOI, and therfore you will also need to supply some information with regards to this in a text file. The data resource you supply us with will be available through the presentation page on a ftp server.
 
 ## Supplying the metadata:
-
+* * *
 [Here is an example of metadata elements supplied as xml](https://git.nilu.no/actris/doi-instructional/blob/master/example-doi.xml)
 
-In order to generate the DOI, we will need an xml document containing at least the mandatory metadata elements, as well as a text file containing the information for the presentation page.
-
 ### Metadata elements
-
 * Name of the creator(s) of the dataset and affiliation
 * Title 
 * publication year
@@ -28,11 +25,13 @@ resource, licensing, copyright etc.)
 * GeoLocation of measuring station(s)
 
 ## Supplying information for the landing page:
-The landing page is not so strict in terms of content and shape, but should include a description of the elements below. [Here is an example.](http://actris.nilu.no/Content/?pageid=39a25e967ef3481b8152f654434c258c) 
+* * *
+The landing page is not so strict in terms of content and shape, but should include a description of the elements below, [here is an example.](http://actris.nilu.no/Content/?pageid=39a25e967ef3481b8152f654434c258c). 
+[Here is an example of a landingpage text file]()
 
 ### Include the following information:
 * Titel 
-* Image (plot etc.) that describes the dataset
+* Image (plot etc.) that describes the dataset, not mandatory but preferable.
 * Data policy
 * Description of data file (s), including contact person for the specific dataset/subset of the dataset (in case there is data from multiple stations).
 * Acknowledgments

example-text-presentation-page.txt

+Time series of aerosol light-absorption coefficients from Aethalometers at six Arctic stations between 
+2012 and 2014
+
+By John Backman*, Lauren Schmeisser, Aki Virkkula, John A. Ogren, Eija Asmi, Sandra Starkweather, 
+Sangeeta Sharma, Konstantinos Eleftheriadis, Stergios Vratolis, Taneil Uttal, Peter Tunved, Anne 
+Jefferson, Michael Bergin, Alexander Makshtas, Peter Tunved, and Markus Fiebig
+
+*Correspondence to john.backman_at_fmi.fi
+
+DATA POLICY
+The data are available free of charge for non-commercial and scientific use. By using this data, 
+you as data user accept that an offer of co-authorship will be made through personal contact with 
+the data providers or owners whenever substantial use is made of their data. In all cases, an 
+acknowledgement must be made to the data providers or owners and to the project name when these 
+data are used within a publication. When used, the dataset should be cited using the Digital Object 
+Identifier (DOI).
+
+DATA FILES AND SITE SPECIFIC CONTACTS
+The files names are separated according to the stations where
+ALT = Alert, Canada, Sangeeta Sharma (sangeeta.sharma_at_canada.ca)
+BRW = Barrow, Alaska, USA, Patrick Sheridan (Patrick.Sheridan_at_noaa.gov)
+PAL = Pallas, Finland, John Backman (john.backman_at_fmi.fi)
+TIK = Tiksi, Russia, Taneil Uttal (Taneil.Uttal_at_noaa.gov), John Backman (john.backman_at_fmi.fi)
+SUM = Summit, Greenland, Denmark, Mike Bergin (michael.bergin_at_duke.edu), Patrick Sheridan (Patrick.Sheridan_at_noaa.gov)
+ZEP = Zeppelin, Svalbard, Norway, Krejci (Radovan.Krejci_at_aces.su.se), Konstantinos Eleftheriadis (elefther_at_ipta.demokritos.gr)
+
+INLETS AND CONDITIONING
+ALT: Aethalometer is connected to a hooded total aerosol inlet. The other instruments are connected 
+     to a PM10 inlet. The inlets are heated if needed to keep RH < 40%.
+BRW: All instruments are connected to a PM10 inlet. The inlet is heated, if needed, to keep RH < 40%.
+PAL: Aethalometer connected to a hooded total aerosol inlet whereas the MAAP and Nephelometer 
+     are connected to a PM2.5 inlet. The total aerosol inlets is headted if needed to avoid 
+     freezing and keep RH < 40%. PM2.5 inlet sample is dried using a Naphion drier.
+TIK: All instruments connected to a PM10 inlet. The inlet is heated and the RH is generally below 30%.
+SUM: All instruments connected to a PM2.5 inlet. The inlet is heated, if needed, to keep RH < 40%.
+ZEP: All instruments are connected to a inlet with no size cut. Sample air is heated to room 
+     temperature before reaching the instruments which typically keeps RH below 20%.
+
+All data are converted to standard temperature (273 K) and pressure (1013 hPa).
+
+File naming convention and data content:
+_atten_ = Light absorption coefficients b_ap(wl)nm [Mm⁻¹] from Aethalometer data. Light absorption 
+	coefficients b_ap(wl)nm are obtained by dividing the light attenuation coefficients b_atn(wl)nm 
+	by 3.45 e.g. b_ap520nm = b_atn520nm/3.45 [Mm⁻¹]. This is applied to the data in the file.
+_abs_ = Light absorption coefficients (b_ap(wl)nm [Mm⁻¹]) obtained by the co-located light absorption 
+	photometers (PSAP, CLAP, or MAAP).
+_sca_ = Light scattering coefficients (b_sp(wl)nm [Mm⁻¹]) measured by a TSI Inc. 3563 Nephelometer.
+_variable_ = Timebase is varied according to the amount of attenuation coefficients as measured 
+	by the respective Aethalometer.
+_onehour_ = Timebase is one hour for the data above. For aethalometer data, same values occur when 
+	concentration is low due to post processing as explained in the article related to this
+	dataset.
+
+wl = wavelength of light
+
+For more information about the data processing, inlets, and instrumentation visit 
+https://www.atmos-meas-tech-discuss.net/amt-2016-294/ which will redirect you to the revised 
+verson of the article.
+ 
+ACKNOWLEDGEMENTS
+Data used in this article are archived and accessible from the EBAS database operated at the 
+Norwegian Institute for Air Research (NILU) (http://ebas.nilu.no). Data management is provided 
+by the WMO Global Atmosphere Watch World Data Centre for Aerosol. This project has received 
+funding from the European Union’s Horizon 2020 research and innovation programme under grant 
+agreement No 654109 (ACTRIS). ALERT: Dr. Fred Hopper and technicians, and Canadian Department 
+of National Defence. BARROW: NOAA Oceanic and Atmospheric Research SUMMIT: NOAA Oceanic and 
+Atmospheric Research, National Science Foundation (OPP 1546002). TIKSI: Sara Morris and the 
+NOAA Oceanic and Atmospheric Research, Academy of Finland project Greenhouse gas, aerosol and 
+albedo variations in the changing Arctic (project number 269095) PALLAS: Academy of Finland 
+project Greenhouse gas, aerosol and albedo variations in the changing Arctic (project number 
+269095), Academy of Finland project Novel Assessment of Black Carbon in the Eurasian Arctic: 
+From Historical Concentrations and Sources to Future Climate Impacts (NABCEA), project number 
+296302 and the Academy of Finland Centre of Excellence program (project number 307331). 
+ZEPPELIN: Swedish Environmental Protection Agency (Naturvårdsverket), Vetenskaprådet, FORMAS, 
+and NILU – Norsk institutt for luftforskning.